Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd1b2d3b39344f0…

MALICIOUS

PDF

101.5 KB Created: 2021-06-25 23:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 00c27a6464db0134da2411c2ff70e714 SHA-1: 72092c12f42c6f53ca36d539410509d9def27e8e SHA-256: dcd1b2d3b39344f077fcb0ed1ff79c714f9cb9bd0501d70ec5b0065fb8bbda44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p3lvanqt6tiuj193rdgnpa6md6/zoxosevuj.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/logipuwawux.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/suruvexobi.pdfIn PDF document text
    • https://banghenails.com/upload/file/89737807681.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xedirivotudix.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ecac3d625---39600915198.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/gunopazunigolixiwetosur.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a69a7391f---33857703918.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/0c0444360346af72cad6c5da3e221054/41475451646.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/pidasazu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6f474e639fafa50270946e822c5f3aec/31832784704.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9da7b5ca---22818193146.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c683d0281d---jejuxomabaleta.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6a2abc30---zukukilotituguteje.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ef8e1bedcfd5e34a8b9e6c12b7c7a5f8/83886467728.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7lari8nlhgnp4l918b2293lhhj/bexujiroluzufodam.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54a8f4eed9893347f0ad5c29f2ec4078/wuvoziwokojelozolasa.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/27249359076.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedda1aafa2---taperoloravun.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b733ae162---99468667227.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/060b91217511e2a18a0fc76eb68d712c/lisewelidi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a29a4d33---63288474323.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/penumumivaxita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=email+reply+thanks+formatPDF 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_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001424e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424E 10812 bytes
SHA-256: 0fe1f2ecf41e3cde1e6737aabf74bf1b9bc1aee7a2e0e0385bcedcb36b3585dc
font_02_sfnt_off00015b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B04 17416 bytes
SHA-256: 485bb562eaf1243448d2e8a6cd6f330042fb17a2690fe2e8d3604ecb4defc122

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