Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60a28e268e17f1f…

MALICIOUS

PDF

83.4 KB Created: 2021-08-22 01:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0b0c960e56d06e147d902c9663b3f8c SHA-1: 5c404441ac0809126c88dbd1f3c636dfb33f5234 SHA-256: f60a28e268e17f1f8be3de7671dee4d70cde0b980902efbe0027b7ee7841dfcd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm and callback phishing lure. It contains numerous embedded URLs pointing to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://coretry.ru/uplcv?utm_term=1973+vw+super+beetle+service+manual+pdf PDF link annotation
    • http://ilturismoinitalia.it/userfiles/files/xobolago.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/9445715839.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f89e3663a---pupebigokerosew.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a1f481d9988d1aaed9135c41124e7231/pifiw.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/39d1a00d09798015e5ab9e81bdc23a5b/28263091602.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dakolalenawatiwilobagipox.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/mikutulesikazilibawowob.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/ximubojawudekajuvewonala.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/32bb288ddb9a0ca9c7d27cacda82d5bf/90272661710.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/73175ee77e8d26768af06d93dae02c09/minopowi.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/6bc7bf2dee509de9fab0b681896b74f8/lojusepijopomow.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9584d2a7---23839471843.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/dasogedinezesimonu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/71341553147.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c911c9bd87---68211359367.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb1f1d11a---26346899634.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160875c599e7f6---dizogev.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0142587001624184579.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc3542726---14315963730.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/bedajirozikulavixireku.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/45601941095.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462480e5ac---5020811552.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_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 11396 bytes
SHA-256: 2534b80f325e2a8a7a19c8cb2b45d5a9039799aac29c02937dd6af22e538d41d
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 15696 bytes
SHA-256: dd1a48914a852046b7cd9ed72e942501882e79a2b702fe17f2366cded95b8d96

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