Malicious PDF — malware analysis report

Static analysis result for SHA-256 181bc15442c41387…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 07:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6cc9fc67524d6a4ce84ec9ded57f578 SHA-1: 5fbce22fca530aa0847ad2b2b282ab97c26af072 SHA-256: 181bc15442c4138768ec31ca60744835b9fdf58537789db5251a9599f582372d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL distribution are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://idcla.net/upload/files/89021422654.pdf In PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/bogonavutirixidefuxoli.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/92761618628.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/fukazun.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/67471249009.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/15276072022.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/91731229482.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/nagajunebabe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4a9d3c5affe780dd2056e176ecfc2967/parugasetepu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a8dd126a---87644567722.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/2323637848.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/86058128297.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4249abba---68130881666.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/61299897763.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/jimesuwukegulezoze.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/kuwirun.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kapifiwiz.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202198104398656.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/muxexu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/mimanulekoja.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/demiwowikerosexowa.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/19699775469.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/dadanedujatenuvazam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=digital+escape+room+harry+potterPDF 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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 10832 bytes
SHA-256: 8e8494d6cd9ccd0af9641afeed5faf346cf225670314cfb044eeb7da31a0875d
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 18760 bytes
SHA-256: 54d81211c94aab4a1d84e0cbf7169108a5f26a19c2c640b74965bf0f54d282c0
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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