Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f61640b297e34b5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 18:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d55c38c20a8055048bfc237afc1f6a6 SHA-1: cd993ec9c78849b5f5cae5e47d2fb9332c4d8def SHA-256: 7f61640b297e34b5eb77ea32e9276294dfb4dd30193538dd206d73022354c885
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://turdv.ru/SITE/files/editor/file/73286688963.pdf In PDF document text
    • http://geoass.eu/userfiles/files/bakefolijuxuguzugelutof.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/39894865738.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rexadifafugamid.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/sexidaxitukefaxevixe.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/76371942193.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/86561097265.pdfIn PDF document text
    • https://aitalk.vn/upload/files/vojupizodi.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210906_140145.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a960d8a450d542cf3d5c60e0eee77eed/mapabimer.pdfIn PDF document text
    • http://altus.pl/userfiles/file/dixirari.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zisubidibomigarowope.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfa61195b---fojolaperegewaje.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zererutemimisixuriw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b89f25891210bf045cffff4704890f11/mivovogazafepe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137c73f63b2e---74804428879.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gedajibolusofituponijo.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dijezonozelupajiga.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/38682558954.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/47107758144.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/juwuwelimurutiwete.pdfIn PDF document text
    • http://alcantara.cz/data/file/80715571646.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1bb4105a55cc488d925e649d36b51587/nukorokirabusot.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tigijika.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/44333912778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=desktop+dungeons+androidPDF 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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 10716 bytes
SHA-256: 94792838667df56842c7bc6aea07f7953a9607103f542aae673dfc3f0e413c1c
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16940 bytes
SHA-256: 3e4fa5203f1af78e5dff031df51d6b3fe1d38ee2189864648d5d865a3ee8a32d