Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f85232681639ad8…

MALICIOUS

PDF

78.1 KB Created: 2021-07-18 09:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8fad5ca3f7539fb60cf7b2639913502 SHA-1: 67cab32412b26155c7ead5f5c5233bb158a7deac SHA-256: 4f85232681639ad81a40a476243e315716b6b315ea38dbb91b890b5e39ce9d92
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wudoxin.pdf In PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7c7a9820---29469316782.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63b011372---20501162041.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/98157937473.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2fmvibhn3e0i58harhglipqijn/bufekugofigujikifa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/437coueabh0qtboiliigarf3rk/tavajopugatowizofop.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b8f6f390500ace0167b58ba6d5ad9d44/3151261111.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tofuxabemozuzafijirod.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dozurujemasulopewujafuwod.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/zadalodefigakivutaxarisow.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/4865497391.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/29932105766.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2da9b7c1b009f377333d08acc8540c48/37937827471.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/75132128727.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/63986832181.pdfIn PDF document text
    • http://myredm.ru/uploads/file/66186554638.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c861a23ba7---13344367072.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbnr6ek1sddpb2jraaqa8f6r3e/73232605558.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23e4df717---82467567678.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/8573152.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/wilefuzipexijawetonen.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/91ae594e6d7b6e7346684e505b1a83ca/nadovipatusakadenava.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ad1b354533c8812dd9b23bdbad05853a/levutajewumifisu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/vubaminure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=icd+9+code+for+pinched+nervePDF 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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 10428 bytes
SHA-256: 23518c9bd929561c298cfcfe2fb22e241bbb6032ecaf463495899b90e132a350
font_01_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 16116 bytes
SHA-256: 8ef5c2bb7b6cdee575047125091ccba4eafadf548307e3b729a6f0fc659ebc84
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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