Malicious PDF — malware analysis report

Static analysis result for SHA-256 f337d701f9c2d5b1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 20:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d111b91811846cdfc524f7022d2324bd SHA-1: 88628c25b409f1ea9f2883984e79ea9acc51446c SHA-256: f337d701f9c2d5b108af79f3d1d111fd30b28b59b0ab5ec543012024a1058a27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to an attempt to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vonafit.pdf In PDF document text
    • https://thechoose.it/file/jakewugudisimuzup.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/vofusalosuvurov.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/xifodotoxamupa.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b33fefb68---73679943343.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31432cfa84---domirepimudilu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/50dd565a7ef7bafcf43a03299f9879cd/30241463507.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e17f076e55---lumuxulimakiw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7a014dda---bezikiturevezigiliwosene.pdfIn PDF document text
    • http://ipllaser.in/uploads/5098185124.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hfllm1clgsjidrq9ib5j6pgmkj/perixilokavipogek.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/lujapo.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210718_092617.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/31129476717.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9fc14557---zozimutamufumedon.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pireres.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a829290252c9afa97e03c8f913d1a9b0/27853639547.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607963c5cb3f6---84149189030.pdfIn PDF document text
    • http://www.toptehnik.si/images/tatiwugawu.pdfIn PDF document text
    • http://qzgj.cn/upload/file/gesakamojexaruwilepuvovot.pdfIn PDF document text
    • http://anupbolivia.com/images/files/7649192427.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c22cb79ee---25405179574.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/39020940793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=eaton+5px+1500+ups+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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 10584 bytes
SHA-256: 95c954a86fed5e6075cf33751e39587d2c17f223cc46c2cb6f61bd119d1f3c54
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 15652 bytes
SHA-256: 6568c4c2f9d43ace2a7bda5a2463cc7aa0c95d1284795bbe943182f63488c979
font_02_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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