Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc635d1861bec716…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 10:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d41dcd349ecb41c3e04ada888f06803 SHA-1: 270d3658796914184b949aae1ccfa25a615b41a1 SHA-256: dc635d1861bec71681341e5458b8dc840e66161ed8214545a8f5006a8a05b110
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ty-universe.com/image/files/20210703_004141.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d7f665d1---68660225266.pdf
    • https://hojoairport.com/images/file/zogurovabawimizotasagegi.pdf
    • http://www.prieteniitehnicii.ro/documente/file/85469687087.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e933121ca---35022207995.pdf
    • http://giadinhlaurenso.org/upload/files/kajeler.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/64229870368.pdf
    • http://baheth24cars.com/ckfinder/userfiles/files/malokepewemabu.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788bd296f---talibefibinox.pdf
    • https://clubsportedinburgh.org/userfiles/files/75506827636.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/54274877311.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df3e3e1508aa8e11fbb99681fc983ea1/42412356461.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/adae40e8d27da024bc98e0dd4991be41/xagasimupopim.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fbe4b1bf2ff4c372e877bf2fc6da406f/3824285330.pdf
    • https://ecoolteh.eu/galeria/file/perobimuzogapo.pdf
    • https://dermatologie-chamonix.com/userfiles/file/7996731343.pdf
    • http://griby.biz/ckfinder/userfiles/files/3349655327.pdf
    • http://ilturismoinitalia.it/userfiles/files/91433040242.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160766907e8ae4---vuganafezinelofi.pdf
    • http://carszana.com/image/upload/File/19899460148.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b0843a1b32b5252f35ca5ade7b05fd65/13659602603.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cabela%27s+gun+dog+gs-8000+training+collar+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f301.bin
a1b1e3056fe5d3c164fdc26e96d64f793683b4fc0c7e48f6d5c86cd67bb8a5a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17788 bytes
font_01_sfnt_off00012192.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16792 bytes
font_02_sfnt_off000139a9.bin
92f4750d5913ae41c5d27811807b743cc1cf67608443c12947a0c1b63d6e1a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 11384 bytes