Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b975ac5e844fee5…

MALICIOUS

PDF

68.0 KB Created: 2021-04-29 10:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b947abf38de75137bd1753484288a2d2 SHA-1: 6d90d89fe0df2a7a6999c7f1ac247047de62dfbc SHA-256: 5b975ac5e844fee59613853167ed2f99c6c1374223257f2ffe455bda45f0704b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress upload storage. The document body, though truncated and obfuscated, suggests a lure related to 'drawing parallel and series circuits worksheet'. The presence of multiple unknown URLs hosted on potentially compromised or disposable domains indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/293521e8ad2cd0dd1996dd0304f4ece5/pexeropelujagusinemurenu.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f60669a72d31b0f1ea90ca7eafafe648/guzopiz.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca11b7a039---nazolasenelosewuwopupum.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c12fbb7ffde0656df80939e1ce7a2770/86155371562.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9dde4f260---povod.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tiloxukikotolifadigo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dpk724ctkeumac9m4nts07ipti/xemedejudopapexedisit.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1ed70610---70679309405.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/726a0735c96322d8fac1ef335f03ae20/61742263526.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089223ded16c---10916343793.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4772ea4f0ed94c69c716bfdae3c43420/xejoxobutiwafu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04a82084c---nirekifu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hiol1t4htjoqgg6f6uhch1rkd6/vekizu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e91ca5676---47199883984.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3dd292b706d3a913de1ef4a5ae544bc2/nesepopimawojemajogin.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/redilazopajukitebini.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd6300c59---pabefegobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=drawing+parallel+and+series+circuits+worksheetPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 5488 bytes
SHA-256: a0abb27bbe31100bf20609891cbf3445e462692914ec759d389b101897be0683
font_01_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 10028 bytes
SHA-256: 55c0a16debbd7a942221f11e7978e1b4e57649f096dd8d1f1d0210773b9f78b5

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