Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbec4d5d7ba4bbb…

MALICIOUS

PDF

73.7 KB Created: 2021-08-27 23:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 168d958d27230992fb2bdf77820f655b SHA-1: a5606e9743041380b8bfbf7cc902b0ad6b1b9614 SHA-256: afbec4d5d7ba4bbb65aa90dbb314630c6c0252f18a7f1d22d25dc110ad2f929f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is part of a phishing or malware distribution campaign, likely using the links to redirect users to malicious content or further stages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/salfhcrees1elb5spqo8nq71b0/mururufemulasuxilalikam.pdf In PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/16365112873.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wenudesovi.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/6683867158.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/mevebifisitezepulemaseral.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/rigujo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53c6d5290---dikaniramabutorex.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/91800748011.pdfIn PDF document text
    • https://2acontractor.it/images/file/bifanudanib.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/44638690026.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/muzado.pdfIn PDF document text
    • https://avenue102.com/uploads/file/panorevekabi.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/levemugimififeviwe.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/28480426570.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rufuzekojulodoludigu.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/jawakom.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607350065d7e5---10167158499.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ruminoweleletejaluxani.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63d6a337---mepam.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/41571990574.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/bepitigijuzasazikapa.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0b3e9f413e45657df9c5f5ae49dae5a2/87204251085.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/70672314435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=land+entirely+surrounded+by+waterPDF 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_off0000bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 10636 bytes
SHA-256: 06bc377ad2032c26f71c2b21653d356460f93a3ac2988d03c0bc7cf0b26cc069
font_01_sfnt_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 15976 bytes
SHA-256: 00cfc159eca06577bf24c7394f013201e4a46b06b4a9ee50d8899fbd19427409

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