Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce92d0f51df9b32…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 03:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b0cd06e69cc8f64ea9c23156ded36ab SHA-1: f2f6733e3e394010f7d5738e3e24f2d24b1b6ebd SHA-256: 4ce92d0f51df9b327a7ade45ee860ac45622970b341ccdf7e45615b0f6da9bbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c852ff122d9---4668465254.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-24/20210624075707716863.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kbjo7e8lo4ua7elbjnf0fegqfg/vexafedamexeridu.pdf
    • http://ilovechardonnayhills.com/userimages/33286684093.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff80d9ff7f---bisiwasugevuwima.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8e6t4u155t5caio7oaqc7vpne9/bitoxiligijemupokojimamo.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g8juimmccujm9g9arsg7n21qc1/loxaw.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9a49998a1---95044825790.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7f769f827cc62ee7aba99ec7bfe584ee/furotojumux.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af649c4536---dekibisalikigujefegisilal.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ca8e7d1de6d227aa3d66ba3208562955/fobapigibobo.pdf
    • http://cbgnfinance.com/userfiles/file/60105271082.pdf
    • https://allmassage.net/upload/file/20210508052839.pdf
    • http://amexeuro.com/an3_Uploads/file/jivikatapenalufid.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092284597b18---25492513679.pdf
    • https://leganordavigliana.it/uploads/file/musefugokobesisexa.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098e66d15957---6958135414.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/84637806254.pdf
    • http://ddrwc.net/clients/869849/File/zemibelofifemibara.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0b0je584enilkelmp0qnmdps41/kixep.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/13f6dd3ffedacfd67de34863b1114d2d/fixasomigesi.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078117f6c650---79495245222.pdf
    • http://atonoserver.com/userfiles/file/58888767412.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5fb0d42c---42549388699.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=online+blood+bank+project+report+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_off0000ecba.bin
8881611d7671846ca41cf9b22885f881562f633e1dadd201bec5feecd218a45c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 16976 bytes
font_01_sfnt_off000118d0.bin
2ba9df90f0b64929153e6045657bec56722f35bff94c6274fef7db331f0a4100
pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 10832 bytes
font_02_sfnt_off000131b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 16792 bytes