Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb0a9bc664d7b12…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 15:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 657b94d401d4c53659c63ee2517e3f9b SHA-1: 4c18cab4e827cd8190b4af93f691bb06c9252f8b SHA-256: 0bb0a9bc664d7b128f2fe7ac0b8d94c0042f94eef99ce20a81c92803e5672ed8
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as a phishing trojan by ClamAV and exhibits multiple high-severity heuristics related to malicious URL links. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pollination+meaning+for+kids.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ctsgroups.asia/images/file/85728143293.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t1vrkh3lu445cmuhissd73qo0m/vepamejatikaput.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pndnlgqhl2qd437of3u8krfr5m/melumomojejegomezun.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlgcvk7d5bsk6kjkr5jfvuuq92/zubixibodavopasapexo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/89881442616.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/628f4fab6ffdb11f1915d65c6bf3e8c3/62050325883.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q6hjqb6oh6rra6cvn6d5fiv3d2/gamot.pdfIn PDF document text
    • http://jarosi.hu/files/file/topifenujojotobapigaropus.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/xelilimuzotegogojekedigij.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973bd66abb3---96985814493.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/bipoxajo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zilofoze.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/zaxafilujeviwut.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610abfe62a14a---91302930132.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9f3321e6f157b2c49a5b1c3105d38940/pabiwenevoje.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/siwoxurosud.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/kodunirisexewadimamedone.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c681041bd7e---46694213895.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vcf0bnmsa0ll8it9g5bep1nhvv/88892377873.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/46276522414.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/gumomapupetogusatap.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c4619bb9---20965270949.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3gvjqpfb8f7hv9q6toqp5pdar1/90246241079.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/tozuzixibofesajidagana.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/88007789588.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6f5030d144e4325b08b564e7ee773ea9/tujaleboboxizus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pollination+meaning+for+kidsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10788 bytes
SHA-256: 301916ef5a97db878cc65009be7795166c1dcd891525161350c962289d06d732
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 17692 bytes
SHA-256: a7d06ecb055748dafc29719ff118fbddc00549f24a12a667a7ea34dbdf3b66f3

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