Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b3299e8849cca9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 06:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94190d3e488e41b3a9e563aba38fd42a SHA-1: 499529801637c11534d5b7c3fcdeec11f078fa7f SHA-256: 40b3299e8849cca9d3a1341e876a54fdc9931541dd76b498fffa19352106c41e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading a secondary payload disguised as a game or software update. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=download+game+psp+android
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424e3e91702---80865430034.pdf
    • http://seyrimerdin.com/userfiles/file/47191014696.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/pagojalag.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/31326152388.pdf
    • http://gostinica-domodedovo.ru/files/85895033983.pdf
    • http://makassitools.com/userfiles/file///66600266671.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3dc83ad78---12215661104.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c4c121e5---dulogipinifowupibufiv.pdf
    • https://408of53crownstreet.com/assets/media/files/rugepemivirimajigamikusan.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/bolaxuvonixalapobupe.pdf
    • http://sahrugs.com/userfiles/file/resivavigikav.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021091212513773499.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9884b57f6---6046413240.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa49b0bef---jizeradefozaziguvorafupe.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/63272346132.pdf
    • http://mclarenquartz.in/ci/userfiles/files/letitis.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/botebiwiwevogelaze.pdf
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/86683302960.pdf
    • https://tsolisp.com/files/file/karovora.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/93615526544.pdf
    • http://ottuk-e.org/userData/board/file/kapefunatadoponadetatow.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/revunofebogoliz.pdf
    • http://marketingnews.fr/images/file/dukeresasabuzevoka.pdf
    • https://giasidaily.com/uploads/userfiles/file/94121222395.pdf
    • https://sausalito.com/wysiwygfiles/file/tagisixowalasozedanoj.pdf
    • http://motolargo.pl/userfiles/file/gederikotadonurixiv.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/lapekabalenatikivurivax.pdf
    • 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_off0000b339.bin
e3eab2ec0f06e0da5283b9acca99eef33260f4c74922ddb600d1245298a8b38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 10724 bytes
font_01_sfnt_off0000cb9a.bin
0515efca5560fbed474f068a0c6e303ccf6c2695d7454fceb373fe7f46f57ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 15996 bytes
font_02_sfnt_off0000f38c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 16792 bytes

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