Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b4cf8f91015fab…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 15:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50fd645d48f73a0bd93359bd6271ca79 SHA-1: 5c9343764db1d9c2236f5a9b3d97a52934d3712e SHA-256: 55b4cf8f91015fab1123cc1e225c02411c512d1cdd75ad360ddc3575f90ce673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, hosting other PDFs on compromised CMS uploads. Several URLs point to these compromised sites, suggesting a distribution mechanism for further malicious content. The document body is unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1915123ddc0f4cacb9366d54416ed935/94787859271.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c690e7e929e01257c6d6ef779b598744/gazagagevipolisorurodajep.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905160727.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/balusogovuvazad.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/10888198400.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/vivewekibeb.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/53736251847.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121907e3170f---sisekima.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e278604c88a---sinexabajekakam.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b683cba3304f46e89ffda63937bfbbf2/wagobirinebugemid.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/doresasoka.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/84691431639.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/84212704189.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/juxotezomir.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/rikazusigul.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zozedelijopuwaz.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/32171763359.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/99033944809.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/6091727096.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/neteduxanetaxoguvada.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gevos.pdfIn PDF document text
    • http://kasargod.net/uploads/file/xamamikididizo.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/61981310121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ariens+snow+blower+engine+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://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_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 10660 bytes
SHA-256: 71f82546be3f5c3b5d7c8e6112162218b16ab581561c5f80fdeefd11849da53b
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 16460 bytes
SHA-256: 159ec9d4d62be445f95c2de08a2ef602efe64949370620a8bfbd59a2646fd52a

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