Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2b3c2df69682f5…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 19:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94101418b925a9316d68e9f61c0012b3 SHA-1: b8b8db8a2359f38adb327c8a0fbc43093154dcad SHA-256: 3b2b3c2df69682f595ae1aa9c33a7e139eb71e74b71dea6bbcb555d831041281
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. No scripts were extracted, but the structure and URL analysis are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://srldirect.com/ckfinder/userfiles/files/38445285274.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b13570d43df80d23330c9b305d687576/defiganenanezuramuped.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/92890367544.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/31526762980.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/28718968110.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab01b1a6c3---28623713126.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/a3b3lmpd1b9ifrhk1ta28oqtj4/43621488695.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d184717591f4e590cf378a56d51b8405/maboxukofalulipuf.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092360eeba56---pifiwowudateromun.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/figinugozijitegis.pdfIn PDF document text
    • http://fotossc.pl/_files/file/mowaliwano.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/2916276233.pdfIn PDF document text
    • http://cloverdiamond.com/file/56392772860.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/juburupuxuzujowofutikimej.pdfIn PDF document text
    • http://sun-eko.eu/files/file/83827151505.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/126c2639e5dfb023264f6c5c3593e297/zeden.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/dojidamamunuvokupe.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wiwobipomekozejiripitog.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/fotisofilobuzefadosof.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/40166852305.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8caf4b9dd---45707498648.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/kusuzosukomanepododomaro.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/j0lm0vvflbrc0rl959vvk2gbb7/kixoxuxakopadi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/11637989651.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb9fd8a10---97109742460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=std+678+form+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10456 bytes
SHA-256: ffd5868b0088a55b182f9fe7d73da5337fd614a0b6f164decac4878c333612bd
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 17960 bytes
SHA-256: f078b0e8f0d0a446bc843dec16d86cc3b5db07d694986d43e104927ac03cb58c
font_02_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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