Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2843c7438b7d46…

MALICIOUS

PDF

76.1 KB Created: 2021-06-23 16:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b28d298601a36ec3b40bcffd3569ec00 SHA-1: 438d8eb391b4321db62b01e6a09ba948469eb522 SHA-256: 8b2843c7438b7d464645a42de9830cd6e3a8fcdfde93bb4061881c145bf2e76e
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The document's structure and embedded URLs indicate a tactic to trick users into downloading potentially harmful files under the guise of legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/afe4e060fc0f062902bb10e14ec27e5b/bawesewuko.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9601da8f3---sumopupufobuwuvasu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/fafekenofajixow.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g2tm2hut4ai5ikhlmtpt6tfstd/wupuzuki.pdfIn PDF document text
    • http://isgsrl.it/images/file/61149970206.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/54035096569.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf6eef9bb---xexugupizojoxujax.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/4321132317.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/76372620902.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/22216440973.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2aa17925360d0dcda8e1d520ee2403a1/piwowumexugunines.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t3aa17rnegjmul2u2qqq68f76t/famafazagulipalute.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7693172786.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a0dde702---44547079027.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e8ffeed0d---97253432213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hp+probook+4525s+user+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 5472 bytes
SHA-256: d251dcc04f6cb1b3acb68e12af82f268d8274d577e488aa817764573fbda436d
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 11472 bytes
SHA-256: fafdaa909d0bbfbab9292dc518ef4580f1bf7220c9d9734633f851d79c9ad2cb

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