Malicious PDF — malware analysis report

Static analysis result for SHA-256 4676429aefe3aa18…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 12:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4689661ac6419625c645f052fd93c146 SHA-1: 39074dd8efd1dd9fd2d55080f7f742b75f38c25c SHA-256: 4676429aefe3aa18b7a2bfc53e5d7203a7cfdd58a918dfb4549c8f36975df277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, with numerous distinct hosts and URLs. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malware distribution attempt, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160855ae48879f---zebavenuma.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/6103037152.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165b198565---71565155043.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/budasubezitobijen.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef8977c4e---sofitulobopozolatapu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ahubrjbmi300cd57dd6788bsa6/julasux.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/kuwazo.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/77723913331.pdfIn PDF document text
    • http://netart.hu/userfiles/file/70279526579.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/93147643583.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210617_155234.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b5bca8600757de2e0df250cb8f4d5f4/94040328079.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/he1ov5mq7r2cnhn1b2va6ents5/juxinasikunosagubaf.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/lipokakinenoj.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pcnqi9lbenkb1g83t0b21b5v9l/1082694971.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b092e05f07---29225585208.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd71e1aa2d---dapofirasavekefeg.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/81216771277.pdfIn PDF document text
    • http://mopron.ru/upload/files/32561185790.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/jamadidigapop.pdfIn PDF document text
    • https://stvorki.ru/files/file/diborovotiwunabemoxitedu.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/54545510765.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4b0ac2e5---lizilunowepujarotiposoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=definition+of+parasite+pdfPDF 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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16412 bytes
SHA-256: 55c1eb929dbdcac4b706e8efa6062fd8678c70e50fb3ac8220248a95c58cb203
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 10448 bytes
SHA-256: 245b5750f4964b5064f5485b7b9d18bd9e4f283cf1bd59f50c0cf8d61bb1bbc4

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