Malicious PDF — malware analysis report

Static analysis result for SHA-256 9505b0c0dbfbfead…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 20:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 200bf20162af79443662d231d5faac2c SHA-1: 912afa2642d7eed63af9701a176338c652a9afde SHA-256: 9505b0c0dbfbfeada028f932112ccaba2b38c73d6b137d5ea3327c7c310281cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

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://arslanemlak.come/file/89852225024.pdf
    • http://kinocosmik.ru/sadm_files/kafozul.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eba1aeaf6---10482573339.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863197756ef---mudefiboxokoxana.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/nt519rng1igm03rk1mshteib53/repakaxidepomajal.pdf
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/92529722018.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5cd62c60d88ee293f7d30314f5e4469e/26873244102.pdf
    • https://egyiksem.hu/uploads/file/tifafukupigufazutakulowuv.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b19d6a916---89974411187.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1tb503qd2pec1t37qgi2bsjpaq/tuvivejagofolatizo.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/785585b80b5a391bac848ac72e69a7f7/27268946588.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/98af1c3623932b88cbd1a8f7ec7dce86/65891574056.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b4442a938c2---gexetesotu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c886d67b0---16978434577.pdf
    • https://iwnta.com/userfiles/file/vadigulodosaba.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/madebit.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c38b08819---nujogirabawujo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m0cc9lqh2roo5kpenubue5e430/newilozuribuvalizifuxojim.pdf
    • https://cgeminfos.ma/upload/file/72611189130.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe50905bd2---wisofubebefizu.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d325b6c70dfeebd521ed59e0ff1250cc/67635134524.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3bcd69aa---66672241686.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/04d3e00fc5ca3154a85ef6c400af9223/86883705636.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea12a69c98---31821735070.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=creativity+and+problem+solving+brian+tracy+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_off0000f89e.bin
ecd9e0d31f5563d79a836824e8363a82fa40ade54d84589d2dab3f5d2ba89c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 11312 bytes
font_01_sfnt_off000112c8.bin
1ae577ebb3b05182478c60b01a4e9c8c31ec095145ce45a0c7fb1d51f2425b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 17104 bytes
font_02_sfnt_off00013f58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 16792 bytes

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