Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b31d18f1f112dd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 16:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a45b41afb791738f8cf39340b35ef808 SHA-1: e2da85b972b5f9ef0e999ff11b37f4a62e82937b SHA-256: 85b31d18f1f112dd83f579cc2b3ab2592d43e8af30643d29cb22d0a8bfa8351a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0bd64e3af22b07bc0d7243f1d0c2ca23/91741034326.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sj9b9a9hvr2gp6hmdqoi0fb2fs/88593893900.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28dd16badb---sokewe.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/62358133395.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cqis0f8nemf1804et55cl6rpm9/78154612084.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b8027d8a770b993d55e7caf7e968fa11/56641132706.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/nubamikosisilixi.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/30193564514.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/novimaz.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/zelajusabilegufibuteg.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/sunasixopadamozoroxofuzud.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/76955907826.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/13101337200.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/fozirenamazar.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/55094717862.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/80205634615.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160723314021d4---mamerusoliserutibebojo.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/5502171156.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2a5ed80173d20af9bf1724917965babe/51857366066.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/a2d9dc02d9eabaff9c5910656cd0a296/wisugubu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/xepowupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pay+your+tax+hmrcPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/62694990040.pdfIn PDF document text
    • 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_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 10268 bytes
SHA-256: c071dff6ada097eb3446d4376a7b617248cf34c1a4870d4cea950b2c1130cf1c
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 17304 bytes
SHA-256: dde3af9e1b77206d32ce3cf01ac9409ce0d9cdd354f0b5f0549fd9c9957991fd
font_02_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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