Malicious PDF — malware analysis report

Static analysis result for SHA-256 394d9b7793a0dcdb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 02:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e112ba2fd29f0c1113e5079172d7fcc SHA-1: 139f0dc619ba61a262c7a5332d81037fc3f7ed2a SHA-256: 394d9b7793a0dcdb23b6131eb6fda3568b17b0c5ec4981bdeaf77586d6264e7c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially malicious websites or encouraging them to call a fraudulent number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user trust for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://perksys.com/userfiles/file/13136088658.pdf In PDF document text
    • http://vinhthuan.com/upload/files/duxowizifuxoxabef.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/nofokazetetuz.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/95029376723.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/muxegabimetuwizaxunoti.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nufavodovisep.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109020122526947.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/67216370525.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/lugavu.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/72373122118.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b20dcb0b4eae1e6ed3db432489217fa9/wavofupimono.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t15abiq6mkqkq2ie8q45orahob/limulugaripa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aa055a13463835bf82660ad7a8588b23/7068544854.pdfIn PDF document text
    • https://faceless.me/userfiles/files/vomajopizuninaduribi.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/86531033792.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780a650115---nuraneva.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/vupuwupazagubu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090401585751.pdfIn PDF document text
    • http://maksimetall.ru/files/tavabenazan.pdfIn PDF document text
    • http://generoussecurity.com/uploads/xamutos.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/746238685613a0471ad3b4.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/93787523867.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/51891149960.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428a57e4e27---11940024147.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tupakinin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=game+booster+4x+apk+downloadPDF 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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 10996 bytes
SHA-256: 65e5fa5c113bfbe66aed60505949c870d8b42269fbbaf452962904f0dc54c521
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 19460 bytes
SHA-256: c3f1f56863586c81cd2b8db12d50972424b66ce864bb989d3de6a1d0bec0c07e

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