Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709f1d71d16f627…

MALICIOUS

PDF

80.6 KB Created: 2021-08-02 12:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f19a768fe05022721fe20947d31c0db SHA-1: cd25fd813840a4c1c2c1ae148db19f25c8267870 SHA-256: 7709f1d71d16f627a7960ec223824bd7febd5b0427d4daef920a2f36353cae46
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a fraudulent number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bitite.lv/media/txt/122/file/vorude.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9a44fadac01dad617bd7ad2feae2bee2/gemalajamedobenimin.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba1e2e97ff98097a3f4d7ff6a42119ed/89139692465.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/bufolif.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/62661946146.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379ef1318b---xawemutuxe.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/50734140636.pdfIn PDF document text
    • http://qca.ch/userfiles/file/xalebadoma.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd506cf357---kaxixorutuwu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/34826042197.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608866fd0afd9---palalosovujipepojenatefan.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf058b8c2ee---5717174431.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/54978966723.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44fde10c3---godimaribizanuteno.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/pazurabunurasopede.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/solumikurupek.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a024315fc---xitatapaguja.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mititavekiwibajapat.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/28704672784.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kedatexikerib.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/kidunal.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lihbohbm1ns2r3deuc2igo7l33/77530674438.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210520080826_3lxcg2.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/16774934848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stihl+028+av+super+wood+boss+air+filterPDF 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_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 11408 bytes
SHA-256: ed8903fd0d75472a3385ca3fe2c16b8109d87e6f625930772a19384914edf4cc
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 18204 bytes
SHA-256: ac7c299c474e065f348ec3c413b12cf5393464f618322f156d66d348df79ade6

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