Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8efe2179a1baf60…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 16:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 243b1f2f2074f1cb5a458dd827969730 SHA-1: a2e4762cb3337602eb880c81b82f88cbb3e2db49 SHA-256: f8efe2179a1baf60b35752547782a124fcfe8260cf481158691b80710cb0e90d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing lure. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The presence of embedded URLs and the overall structure indicate a phishing or scam attempt designed to trick the user into initiating a fraudulent transaction or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=summarize+pdf+file PDF link annotation
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/69938120199.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847abb2d639---tepedowosofe.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/10pc1bqg749je33acsn28h8ha1/gomojigizeruxugufudu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7e353062---juxumexagixedujiza.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/56723953574.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cc78fc836127c6b3e138a1f4505ea7e7/vijive.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/ripasomanewigun.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/93b1997a93fb3ac581c69d7e23f53ff2/68050092776.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3663db89---6779931927.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f256067e---kojadodopuzokam.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/74301027575.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/324qgtd11v50je9v48itpo0g67/sewakijuratefoloka.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/54595001505.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d067eab6e---27302862514.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/671eaa283ac6561ad4017feb102ce688/dokilezuvuva.pdfIn PDF document text
    • http://ranch.pl/files/file/limol.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/50579b6d78675a18b5a3923c1e1deef7/varokitepuxafalemawivupak.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/nezavelewakute.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/dudomedadunomesutu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/lijelesesakonetukodedozok.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/supideforenigov.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48e348d93---mekuxurejube.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c88999a8---42018462842.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_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 10404 bytes
SHA-256: 2fb0a07e7ba17ca1c798daf0d28bca5de97c65fc4371f7f964c1945b699c5f14
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17292 bytes
SHA-256: 4d11bf5642825fed2687f7a6582d3ff1f29c57439d2ab7b1d92d404898da2967
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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