Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d5a2cef0306140…

MALICIOUS

PDF

70.2 KB Created: 2021-05-02 04:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92a747cf1f9cc82b743a7f8025e8258 SHA-1: f3bbd5f203ac8a71d6ea8bc150cdb9432aa0dfe4 SHA-256: a9d5a2cef0306140f298ab51649663abddb627d973d506a8c712dcbbaabf2782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6lbqphep804fgqpic6qn0o53v5/sivekefimezokuj.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084e2aa80ea3---75567940633.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/02f6a0266bf5f50d24b14d95cc443e4d/69556852226.pdf
    • http://aucoindeshalles.fr/menu/file/76168619119.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9bc5ad57---99093239145.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af49a48348---wenadawekiri.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088248191a22---53028382367.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0863e7b15---bipojudanipalas.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/11047f1dda4760010b3b9778d87a7826/87310743174.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/93b391r68t4fpns6f7gdgah3nb/xowowotopakepewujeku.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791b42ad42---gumesonet.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8id85m5fohmg5opp6p3kp3tndo/62626062923.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/47a305fb3f93c2f8f3fbe2426cc95471/bogunubonijogadebug.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1s55oomigqoofriud3gi4rlsk0/gelip.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5db49440f3e99e98f43769028df8c9eb/fopudokitupujuxiwak.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce76ab3f30---47715851905.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160712faa87726---webogewobunefujafosupen.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7cbd8a11---bilibarize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=formato+carta+de+amonestacion+laboral+chile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d469.bin
90b60bd1dcb8dc53904351f6de8c7e0fb29bc1389f483b9f3e5510c24e95ab8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 5272 bytes
font_01_sfnt_off0000e620.bin
61c9792241ff4b1803656f619ddcf09e9deb1f243e40691b683140b06bacd666
pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 11520 bytes