Malicious PDF — malware analysis report

Static analysis result for SHA-256 336e14f261fba5c6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 23:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6671de7c7ff3170218613bc5fdcd4959 SHA-1: 27e25ed0f1f3621eb551933e47c116c07d74afb4 SHA-256: 336e14f261fba5c6f2c0aeaa281ec23ee8064b5f6d1ba13c8f1c261a99b77c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=print+non+printable+pdf+online PDF link annotation
    • http://www.centralperdana.com/file/28402645561.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/83cf9575c70c7a6ca8121b75432bdf83/49275490969.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xogodur.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ecqvavkt346i1veh9jo950tipb/rasalepekabuzasogagedu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6e6d5e64c0aa4143b794cbf04c3a9209/19178210794.pdfIn PDF document text
    • https://qigoodteam.com/uploads//files/202108070230347813.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/gijotizegewotuvowa.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/25586007196.pdfIn PDF document text
    • https://songhong.info/userfiles/file/wejoxolojadewakezigibix.pdfIn PDF document text
    • http://efsanepin.com/calisma2/files/uploads/69239788564.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/tigujatanebidore.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/vobemerikudefiloto.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisiwadu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d801ecddd05e0253f013f3c43d1ec26f/menevodozavu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6b0b70b8---selagafisofixa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bb0382a0d7ee8053d20bc68ea079129e/40574170414.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102d1d7a7f18---28826648813.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/985fa65d4a698187038d48124f328b58/1680467373.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afccb59c1e0---gekeputosuwedaso.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xaturu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/07gg0o05apsq8ubap444olh6l7/77369283355.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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 10464 bytes
SHA-256: fcc10ad86843cf26b81a76dbeb65b76188daf2a3d7ea97e95431677d39c734ee
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 16792 bytes
SHA-256: d5ea8c9d2e5b569e28a3c25ce5234aa7c50cb9dfa5edc62f17be4c13d3a5b760

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