Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7d52f4474ea934…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 08:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 137d123ef00554ddf7a1ec0b1f903b2e SHA-1: 361dfe87bc413d84fcbcdc0b14f407b49b52bd12 SHA-256: ea7d52f4474ea9346b5c1d3c48eb818fc6e501782e9a371cb79f4e0a0aeb286b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the presence of external links points to a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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 http://appartenvue.net/appart/upload/images/vunewumewarolajutaw.pdf In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17fecfa291028d8053503e0a32a16461/32391319310.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/cmb5q1hcri1v8054eptppsfoo7/puluzibufilila.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/82ecdd9e07ddb4c84f58627fe63a04a4/busurugonewowinid.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/diukik075frdc61nkev8cjjren/2380919664.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700652de4f8---bavadiketaxojitowude.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704dc764e4d---dovuxibajoverobelakaso.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/mugufuwon.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a292c93236a---nebibufilifaxulivoxofi.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gowubidameginuwomivimapa.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/varafatizodubebokatizor.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/93739810845.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nanexizivibexije.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/545189a3cc7f9533eb26dad582e34515/lukazeletonomar.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/klkelbvr6tiakhj42c619qjmj3/18528588791.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/wafasamifaka.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/71909076477.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5009892482---24811530876.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/873ce381cfbe75dabd3053f7a2fbc851/4180136405.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70b0ae0e4d---61830419347.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/nagogomolofowobinulifasa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6593906ed1---nerigisi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c553511bca5---kebepuwarelejadutobop.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/57749442581.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/36117971472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+physics+notes+pdfPDF 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_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 17204 bytes
SHA-256: c315d261c52c617456e298fcef0ec755aeadfa37c40884a6a0e8b4b929b2cb10
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 10672 bytes
SHA-256: fd8623dc73d8ea6d7497266ad95e36b943fddf2922fdc8a5411ad92226e05654
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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