Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1840d012d5a00ff…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 21:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0a48b73b1bf6bc4261ad02237f6c637 SHA-1: 896fd88b4d1ce973e452f355f2123db11abc4275 SHA-256: b1840d012d5a00ffe1bb29cef3eb9d7477a9ed504e273725fca481ff85401842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11127847351.pdf In PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/kerurowivajuli.pdfIn PDF document text
    • https://fallsplat.se/file/xirakisafunagosunejaler.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/91e6ff5fc4a535f60e95a02ada4395ca/10671729163.pdfIn PDF document text
    • http://video-cycling.de/files/file/sozotozafakunof.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/paxeluvomekogobadilib.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/4831238901.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/86643013938.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9bedb269---68645973791.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/zikotibur.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1b2191210d090066f650b6a9ee28cf5/sevurijowetopijapawiraxu.pdfIn PDF document text
    • http://netwindowvn.com/uploads/userfiles/file/mavesolugaz.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/61495321421.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/texigojirudulununis.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16104910667618---88936440039.pdfIn PDF document text
    • http://unityproductions.com/upload/files/zixudatogozeburapopux.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/sawapitupavonuzowufapuji.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/lamejukejokunubexes.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/36415389055.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c4ae8d23ab1510220e608d3bf38d79ee/71909770619.pdfIn PDF document text
    • http://melvin.cz/data/65663882373.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ff66b2bb55e3f0dee80d14648984e2ad/84649345841.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/57463888880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sierpie%C5%84+2017+matematyka+arkusz+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 11300 bytes
SHA-256: 7b5e1feba5ce8028f503e232c4734c8809f5a37c691f5514dcfc9968099f811c
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 17312 bytes
SHA-256: e04ebf5000f0b532d798bfd7ea7d68a996451f8a4568b34a83fc33ba5e7fd0b5
font_03_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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