Malicious PDF — malware analysis report

Static analysis result for SHA-256 d133cfd1537d1b2f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 07:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27ec061f5afab96472c5ca828b52bda6 SHA-1: 9dbce8860114cd35c5691bf6a24771fb80116c38 SHA-256: d133cfd1537d1b2f72b5282c3572b859f5fac03e2d0ccd635d96a5038f690adc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pastelbuilders.com/userfiles/file/12777933068.pdf In PDF document text
    • http://studioghittigargnano.com/userfiles/files/21572429551.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3a77ff8df72bedfd20a85d3f859ff905/zujiju.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f57357fd---64089586699.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wumeboxewabet.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/13457265991.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/lodofikuwapinuxopagizizew.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/pemawafoponadanugeti.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gilewikulirazaj.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/maberatogud.pdfIn PDF document text
    • http://texmet.pl/userimages/file/fetulusuzitajapotu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/71790655782.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/13370100634.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ebef98c15---94052505048.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/vopip.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fe1d914e---tejijavawevanuzijerajo.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/71263808623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cute+black+wallpaper+for+iphonePDF 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_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10856 bytes
SHA-256: 781b506de5f55ac70e0438ba324a1d33726857aa8774d1ae56e8f35fd97b2ebb
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 18468 bytes
SHA-256: a4a04b8145009e2f7952c58966f6fec03dea521b5dde756d5a18d45f8f27532e

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