Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0c4c8967756c18…

MALICIOUS

PDF

137.8 KB Created: 2021-06-28 05:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a80a1e15ef854f7063077f70da2360c9 SHA-1: da8fcf8228673c9d9a39fb8bdaaa1a9ca547dd98 SHA-256: 7c0c4c8967756c186a8b180c56797b72cfcf5103327774345b10ab07228e3881
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8803fb12dfbea5a506cc3a9685688bc9/zokojavavaf.pdf
    • https://alshaabcoop.com/userfiles/file/48954490783.pdf
    • http://cn-junsheng.com/upload/file///202162161033133.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607751ae961ae---winim.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7d034e3385a0c1b92f7236aa87f00b89/67387386339.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608478352d5f1---nezalogob.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a98583364ad---penodosawinevajejomi.pdf
    • http://afghansolar.com/userfiles/file/11483339650.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0aa96864---24046554550.pdf
    • http://sanphamhanquocymy.com/uploads/files/konuvalexexelilokosowina.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afafd51384f---18203722979.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/zelin.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/63ot23fbvkem7kj9oh2gj5bkl5/zasewuxokojuvetemajidi.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2847e580---xeniruvosikodibi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160778a89765de---zitebawoj.pdf
    • http://bocghedanang.com/media/ftp/file/11653741534.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75d8a0c14---25200538962.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c652106d288---7040874335.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238103da40---mitoriwixopot.pdf
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/88861245429.pdf
    • http://worthingtonpark101.com/userimages/kuwopufamifisadasinus.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/05f3e55097158f6f253c67a7fd844815/lodimoxalavofoko.pdf
    • https://smartcirclegroup.com/userfiles/file/dagobagi.pdf
    • https://muratay.nl/userfiles/file/zuzizumobobijabupejo.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6bf855271d9536ca31d1e688efbd9aa6/wuruwenibavetalat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=heil+furnace+troubleshooting+manual
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505a2a55cf---32497332463.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_off0001b518.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B518 16792 bytes
font_01_sfnt_off0001cd2a.bin
7cdfbe5d8561aca73f5759efd0479ac5ce86d52b61710c2d791f13551f8a3453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD2A 18864 bytes
font_02_sfnt_off0001fe24.bin
20f5ee11f29254c0295a5e278f39b93c9aa016af362141eef55ea1f86a462534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE24 11012 bytes

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