Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5a79db09c8ab58…

MALICIOUS

PDF

67.6 KB Created: 2021-09-18 05:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3d99e5557bb030eed24adf1d1ebe294 SHA-1: 31d40680711ea43bd4f805a2dc9a30d8bcd0f1d1 SHA-256: 3f5a79db09c8ab5852c40996cdd61d50b20194f3701172d13095bfa69accb40c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to look like a legitimate document but contains numerous links to potentially malicious or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=android+voice+call PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/paxejegokaxipowinadokos.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/96900069952.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/fewetenok.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/mumupuxikupo.pdfIn PDF document text
    • http://wajl.net/img/file/202191011354.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/98299603748.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/80618680131.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/tixilerotijulagikusidamet.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/raniwepifules.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/raroxilejifijufogarebo.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/57653272418.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xurod.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5b77425f9f4760eba8200f75b226066c/96704852264.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/52589442520.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cdaaf2d2b---17631024718.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/69206138588.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/wokimapugozakapon.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16971706649.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vodiwarikusapaputufa.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614213745a6e0---dijivowukovul.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/xitivobomilewotike.pdfIn PDF document text
    • 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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 10144 bytes
SHA-256: d78eb1c17a85d643c5d210f8219fe38701fd7a4440098c1835f9d29fa0ee4018
font_02_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 13960 bytes
SHA-256: da1b3d01fcc2ff0fad87a36ea53dfc77325215ddab3ba7a456032600fed3d3d0

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