Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5c4498529b7851…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 06:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe9b4b14aa23e5e7815ed5a62a646a53 SHA-1: 9721417f3d487e3382e34d2ae2a2951bc1b5614f SHA-256: 6a5c4498529b78519ea3ad19fe707a7a9809dd2c2b10d865a97758e0d7772af2
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ecoretras.com/file/97702686697.pdf In PDF document text
    • https://animaliadielisa.com/file/34915902777.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/fb8e22f6cda7c2d8c3283447d787c491/vejipiw.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/37953707110.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd800ca26d---23863192694.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/70073403593.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/19654274585.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/padutiweno.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/24002158140.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nifatezut.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/remes.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/63207750780.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/18309104830.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kigupavudegirisotoma.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/bejilexidarokabofabubojej.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/dadowo.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/vozunobimakam.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/59cb8l8g1nvev0n2v5aek2kei0/finisa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160983e1888a41---xevajobiledejajugo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/27f408043e9ccd7707d350f7b922086e/48190587995.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/nativiruxalasaxiwijoxe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a724d02a0---5762459458.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/5281839278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+heinle+picture+dictionary+first+edition+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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 18012 bytes
SHA-256: 9940872caf1770e3237f6e3a3f7571208162e71da0b8d48bd60c4e72669c6afe
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 10892 bytes
SHA-256: 2483a02ee5e50d255b5767f6a13b3b7b1255476f00148aec5c70dfcaf5686936
font_02_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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