Malicious PDF — malware analysis report

Static analysis result for SHA-256 23733f5078f77bf4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 16:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2587045812679dc87442d8c4699e25ea SHA-1: 59e4c62aa8735a7d71b75366492c1fe5318778c9 SHA-256: 23733f5078f77bf470cb1131e3b208cd54b3052bf67a8a20aa2bb8e76bc9ea91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to download further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://henghuitong.com/jingkelun/userfiles/files/20210905151851.pdf
    • https://jamurgoreng.net/contents/files/45418598468.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1f670a6f84dcfad430b60cfd595f3ae4/28192877662.pdf
    • https://rainbowfurnitures.com/files/files/gexesuveg.pdf
    • http://thechitay.com/uploads/userfiles/file/radulebomokoli.pdf
    • http://nissanotogovap.vn/uploads/images/files/kadazirepujaxopanotefuwi.pdf
    • http://mishor-uvk.com/uploads/files/metitemajufaxizonimevuguv.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ampk294gohanoju773edp8c2t3/31591194934.pdf
    • http://tomaszskiba.com/userfiles/file/gatiseleguxi.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/mamisisagi.pdf
    • http://asbazainville.org/userfiles/file/34536847844.pdf
    • http://findingthegrey.com/userfiles/file/vibiputigofexumu.pdf
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/wusesawudo.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/divugixuwanudazejom.pdf
    • http://shriramashramssschool.org/userfiles/file/2087107603.pdf
    • http://bedrucken24.de/userfiles/file/nukuzi.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vrihv6cudgf25rvmo2doaame0q/ziruguwobazudukokiwusoxiw.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/fovanem.pdf
    • https://theipbuzz.com/images/file/63628770111.pdf
    • https://ccs-corporation.com/ckfinder/userfiles/files/76720722750.pdf
    • http://telek-trans.hu/editor_up/51951199855.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=y2+download+app
    • 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_off0000d439.bin
5930fa992bf04a12697f5a32300fdff566678316006405f5be1ce2554eb44f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 9984 bytes
font_01_sfnt_off0000ea85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 16792 bytes
font_02_sfnt_off00010297.bin
ab96d93c261a1dc8585f4866e86263bbc6ed4a16f34af7c0100cffd0685ed5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 17084 bytes

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