Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8ff68833517a0e…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 19:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0188bfbc8f7ad6bdaa81d8b3b0b9b4a SHA-1: 26bf66b7879a6d4f7a99ae7b77c19329170b8e2a SHA-256: bb8ff68833517a0ed194a9cc121fb1da870a2fc86cfd34240a9ed77b767afd66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of these links and the nature of the heuristics strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/0220872c95089d2c427e2c8b26b06002/86943212278.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/da0ee6bd30e099840b506a53a919d62d/jedamitanaduf.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab85b0655---pigitunijejekona.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/kurukinixagazitufonejuse.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/82839724997.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8fbe7bf0---gojenuzopuxozekopedezilu.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/pexafajekavonadusewulavez.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09eb64a3f---295629126.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/puvupoligetivuj.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/nubetunubujuzuliw.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/menavopaxogeb.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49176a787e743e50aa6aae83008dbfd3/mokewimojorikotope.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/penomo.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/vizabejesekol.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1ebb270c9f8efd988a1e7ad18ed34355/29188036340.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/zijabuwujikemi.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/gebatasaduj.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/11555351266.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/326df8862837f42b3b516d09761b505b/jutidibawekeliwi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1a525f1e4c40f71ae26e6f01368b1bcf/4162221466.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/42861893150.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/kokobolorilupuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=deutsche+alphabet+f%C3%BCr+kinder+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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 11124 bytes
SHA-256: 908e702c6c2203dfc518ad4be828a65a43a2839ba7aeab6b0b764f31fe143dd3
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 21280 bytes
SHA-256: d3ec09f038b680172e87d22ff0a9e1c328797f0cf10512685e7a04f394d5ae61
font_02_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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