Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca2407d4e095b44…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 02:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 941bc1331c8ae5792b130e90e6d7cf64 SHA-1: b886b4d17048348506e02253594a9e873bf44b2e SHA-256: 9ca2407d4e095b4480881fae140bf7220970e785ddc064531573b02ded294e2d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm and a callback phishing lure, suggesting it is designed to direct users to external sites. The presence of numerous unknown URLs further supports this, as they are likely part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.nevjegykiraly.hu/userfiles/files/28717003203.pdf In PDF document text
    • http://195exim.com/datas/files/perazox.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9e15195bd---8960997916.pdfIn PDF document text
    • http://viettruss.com/upload/file/jupurigigidamodobot.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/80181252843.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/6354368553.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bajuboladoxamakinimimori.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/diwozakekejuvavujov.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/63389062481.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/75278166366.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/finozizosigaf.pdfIn PDF document text
    • http://nature-revive.org/files/file/zudixejunixugo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b10499ff97987d986077f3452fda7ad4/943176808.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/35036996850.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/95854157128.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161412bf57a7ab---juwigikobojamemavasusej.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/44962232721.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210924012337.pdfIn PDF document text
    • https://conrays.ru/f/data/kamilo.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/wigovasubojonemagigukul.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161327d5de0eb6---supelebos.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/24266736122.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1983058961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+games+without+internetPDF 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_off0000b024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 10888 bytes
SHA-256: d9509c59b75f35c48e99b2db85869a7ba8c80707b6c9bcfd783200d5fff29f40
font_01_sfnt_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 16892 bytes
SHA-256: bff2b76afd481f582b5ccb042a6ec1b8ab3bb675d3bf4e744e152e28ede750ce

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