Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff372f6ff3a0f21d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-15 09:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d28e0ab9d2cb93f65e0362940dded0f SHA-1: 9d91d6a1a1dea8e55d297471497a73b4c6076e5f SHA-256: ff372f6ff3a0f21ddf3375a00622d0474915fdb87fbbae22893bf0c06dc9355e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms. The presence of multiple links and the use of 'utm_term' parameters suggest an attempt to lure users into downloading further content, likely malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://villamishkan.com/310renonew/front/images/files/43689751090.pdf In PDF document text
    • http://learnersdigest.org/userfiles/file/18608521643.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b757a6ef022ab502173cb761c473f60/gozefujovoforotive.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fakaleteja.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/10722131554.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/lerosepefiguw.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/fafoforezel.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/safukewekarivekimogapebus.pdfIn PDF document text
    • https://ckmandarin.com/uploads/pijevojizokogo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d678568dea---kavewisibuvelo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/38629639928.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d366de3824---vevijobisadidubakug.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/bizegokanara.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kfm6hclo4up29ncinm2139v5ul/78810375267.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c01339b99---4466185271.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f5d86aee309d28e1a4daaed1ce4823c2/dizakevipivarajufamiv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160974f2fbf85e---8653025223.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/48842947668.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c9klmnha6v93m91q7ar0mb1ttv/51155070841.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lqf00fsg39lu40o2obcoc53qof/39221238460.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3691e706e12f30a89358cf2ba8089500/wujat.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/guwujegumevuzaf.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/66474745429.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/13267063992.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95b790de81---64061634197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=halo+1+free+download+unblockedPDF 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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 19060 bytes
SHA-256: e48ef394d890a22908c3a5c52d0bf147a77d80af3b100c029fb5549b51e76187
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 10572 bytes
SHA-256: 8ed82cd041f87cfc8c65eedca3e9d18713580459489bdeef4b094c4881196799