Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e938cab7be0b2d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 14:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87ceefe72401411468b55778f22d3dcb SHA-1: b47201e3dace04930c663c1f1dc8ad147bb581a2 SHA-256: 85e938cab7be0b2d1ab058039b1592aa2269623fe5ca94a8ce2e9d17983add64
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://koreanhotpot.com/uploads/files/32881903654.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/defdea5b9ed9b3e276b47a5c86f2c037/xopewanudagolavej.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/2ptt6r2tessr2jsmo22k1efqvq/20663697090.pdf
    • http://alnoorcity.com/userfiles/file/498955679.pdf
    • http://project-lovcen.me/userfiles/file/vorebogodajobolisa.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ef9673e---niromipozipezujikevubeta.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/addi9uhu9he2chbrsvlim60upr/kogoboxikiboniravadadage.pdf
    • http://iphysiology.ru/upload/kivakizorodetarumi.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/43511854997.pdf
    • https://sssmri.com/ckfinder/userfiles/files/80895524762.pdf
    • http://alituncer.com/userfiles/file/62883476827.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c9ff0e25---zorudixedalagukufirole.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/91fa28656b901b4963feaeb34fb1ea89/gitazotoxelodamobesilipiw.pdf
    • http://naturallabs.fr/userfiles/file/69321079673.pdf
    • http://brmxn.com/userfiles/file/20210522140522_ryf8ha.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa993068603---rofiviri.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/zujagetevare.pdf
    • https://m-isc.com/userfiles/file/sovevolesivu.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cb39387f---9260067930.pdf
    • http://inspirationforexcellence.com/clients/66491/File/36777195920.pdf
    • http://daydreamspin.com/userfiles/file/32196644313.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/04b2cc2df8c7137b0101c50129e275cf/sebexedejipeze.pdf
    • http://slanfusa.org/clients/47225/File/38565223227.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+fattening+are+sweet+potatoes
    • 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_off0000f46e.bin
6e6fca941968f3948e82d8195e017cb70fb94efbd0e1a8b660759701fd33b3cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10564 bytes
font_01_sfnt_off00010cb0.bin
856644afb6c162dd73fbe4e6f87a30aa26fa54960d56de658701a94a6a593de6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 17784 bytes
font_02_sfnt_off00013ac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 16792 bytes