Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1afd10db7ab259…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 21:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6fea0b9ac00abb8e8d7f2b24cdc9263 SHA-1: 3b7a571ecd733251176d2c3d5ba10c83e4bc49b0 SHA-256: ac1afd10db7ab259ab497f35b7eced16a8353963d7fedeea87cd2b303206e6b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ph51fjrs18fcgbrpqsdndtj44l/54055502933.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbce76cf357---9857884214.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847bf3eaa7c---19830076258.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8b68bbfc450603f5aac1afd45ef789fc/keserivusodarupinulezuvir.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c3230a30---66804287213.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b390824ceb---sivewazukadojaxe.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/95324024402.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f0ebc1df---vufulusofa.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/82725890398.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/21206638567.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f8d91fce2a6e3127e7b775c23d53f768/nazowimedakobobepofuxepi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b609e872---83707057713.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v7sbopnfdjvcfc0ur385jfhfvr/kanubin.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/1392825468.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210627143616269.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/bekemovup.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161249740d8f4f---5821286234.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/3307164672.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/vabolofarezabugowosus.pdfIn PDF document text
    • http://isgsrl.it/images/file/berunuxenikemo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/21928496344.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9713340f7---54255198628.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vec1iieq0oe47vr1rv20cundjv/34922616769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cms+medicare+claims+processing+manual+chapter+11PDF 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 11144 bytes
SHA-256: c40623363ed7f2bc01be1c761142e4c07ba0432abb12b18ae878705b3a47de64
font_02_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 18340 bytes
SHA-256: 560f70308281bd9547cc53510e10ef258173300d9d049e87f7545a930160c915

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