Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf41f9aa6ccb9494…

MALICIOUS

PDF

96.0 KB Created: 2021-08-12 22:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a82c1af4960fb0bdddf177790d73b195 SHA-1: a130096d90edf64c5683380a618d0cf6b10414b7 SHA-256: bf41f9aa6ccb94949e120569d3c845c5c80ed3eaab781ee356f76dccc92a8866
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a phishing or scam attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in one of the URLs indicate a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0h3p5q9kiu7bdentcithvfmctr/45394348971.pdf In PDF document text
    • http://uci.ir/userfiles/file/jawewarapi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/773f2ff292aaa61609992caef42ad103/95765267696.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qp3atdoq24co8ghqege9j6elgb/mewodemog.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f35d8967---gonosakowise.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/87e5d89dd829c0777979636211c895dc/pubuduzuwinozurakuxojuweg.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/90494412657.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/kojimokovapewelebuj.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/47627843770.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/latubozaxesavefifafazovam.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/24734955674.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6cd9367a4faeb38ed9e0c419ddff72a9/lubijika.pdfIn PDF document text
    • https://hoavily.com/uploads/files/8806659317.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/80027964047.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lu3viid9s35sdanmkki3md34r7/46795615685.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ddd46ecadcc89af3e9a25ffc1bf0103b/fekadugoli.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093527920c3d---17683112331.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210807045059.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/ronegoraravugigaz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c1c75507---43369611619.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624760df62---43457222000.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7896977366e18ed3fbd0900467d811f1/84849138196.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/puronefuxulagaxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+federal+crimes+do+not+have+a+statute+of+limitationsPDF 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_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 10900 bytes
SHA-256: 8bf7c86c81a8ab09d32104cf74da86c89d77d82b9abfaf44c92bac28993a0fbd
font_01_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 17156 bytes
SHA-256: 4a348b837bf35e5196c19303b100dad31780102004af8a0901fb13c688c30dfa
font_02_sfnt_off00015990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1