Malicious PDF — malware analysis report

Static analysis result for SHA-256 81329c4ab5ca3aca…

MALICIOUS

PDF

106.9 KB Created: 2021-06-27 20:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 21cc03b4fa73507693607a072de64450 SHA-1: 0a1157771772f448e76828ff13e9bc1d3ffa7cb6 SHA-256: 81329c4ab5ca3aca75c55d8247324baaf0ba659df39719df2b2ef0599d6a9473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous external URLs, many hosted on disposable domains or compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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 http://blbr365.com/userfiles/file/1623017133.pdf In PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/73232582101.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/41668396167.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d3d5bfcd4da5be5ba14d2823ae0a03d4/62401564636.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/35082718215.pdfIn PDF document text
    • https://langumeistras.lt/i/File/69511056313.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628ea4948f---15677846574.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/15839636967.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1b6igboss39m933o8najdvvf4f/tuzir.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca766b816c5---fifosegu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ouof7m8vqmj1rhvh8khs7csgd3/bomad.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0bccec830---newixisubifigomojisiso.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/91370231089.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gubike.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/13d1a0d753dcb7b0ede3f2c670aaceb8/16750299426.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202162203019.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m1sgdk42dqte4bndod500j8hvp/77998785209.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/k279e5j3ff6vk2v7qhmb69hsh2/fewogaguji.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/31215431453.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b6f9eda99f17c524e75565ad98877c75/zelenipa.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3c945cfbd3f4978d780b6a7bceff6762/logemola.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098663862891---13726774795.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bf877fd96e8---48895748614.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ced8e6dca8b3bffe0bbc51476cc6593d/394868428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ucla+parking+structure+7PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 16484 bytes
SHA-256: 195a00703b25fd6c0944428b04b74cc489144ad34a4b37e1801189682c179c8f
font_01_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 23832 bytes
SHA-256: 4f62ff2c3e6a9e2a3af16866400a48140ff212461c3a63fe2218cf832fb194c2
font_02_sfnt_off0001633f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633F 10676 bytes
SHA-256: 0b7094a4d04c64ae2974f83f4bb29447359f1f1f8a2d1958d28249ee6f3ebdf3
font_03_sfnt_off00017beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEB 2164 bytes
SHA-256: 1bfdf978ae49b38f549494feb1d214c5cbea4e72a48f386f1c67ebfc1d394d81
font_04_sfnt_off0001857b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1857B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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