Malicious PDF — malware analysis report

Static analysis result for SHA-256 442a9421e577d567…

MALICIOUS

PDF

88.1 KB Created: 2021-07-26 05:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cc9c43829e2b285cf6c672d20eacc3c SHA-1: 7d94ee897271cf405667e966569f6f59471a88fd SHA-256: 442a9421e577d5676dad01a80427d2c8ecdc6980132f12e9355784efebd62526
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external links, including those on compromised CMS uploads, supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coil.hk/upload/files/noxasabegezozewowaj.pdf In PDF document text
    • http://info56.ru/userfiles/file/valeru.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa97502cb7---fewojekuxidamoxujanofak.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4960798522cc0f154bb55d2d400affb0/debedojenosiv.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/sawabosalabegidijofegode.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0177398f9b9d168f8af2e02740de179c/59804583704.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/wixuxugimedopabejo.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e8e00eda34b5c4e309147d3c224a9c52/8664144105.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/16192463524.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc40d50a02---32346029114.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f3772769---motonawel.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/96750912106.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/nofirumot.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3abd1893e867f0cf4c81c69058237d8c/34157937615.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f24c618721e9f43af749f777033fa999/volenefedevegubiwabimo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cuphtphq893hhlets1r2qhl5n5/90299269813.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/2602926397.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e4ae439bdd2115e33ff4954f5b1af960/gasugew.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/tasajodidij.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65da8ad1e---12454056259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jolly+phonics+reading+books+level+1+pdf+freePDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/vutom.pdfIn PDF document text
    • 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_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 11256 bytes
SHA-256: e5c08c6ffd292fe8816a4d2bbd65339fe373f6cb37170c47bb904db964620c9e
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 16988 bytes
SHA-256: ebcaeae8a8021da912358245ab3764853a6c748d16b7eb37fbbf33ba48d38e75
font_02_sfnt_off000137e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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