Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcd294a91da42e9…

MALICIOUS

PDF

87.6 KB Created: 2021-07-10 04:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bca6c47c4d3d76517104fc63df401a98 SHA-1: b0250c66ddd6b76ec563bd543a27fdc61bf214b8 SHA-256: 9bcd294a91da42e9071f7b1ade4776da669516eec8f0566d6fefb2ca45d266db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://albatrossmrn.com/konadnew/userfiles/file/89145143997.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f5180a64868ad84e5b246f17a1a174c5/9811491734.pdf
    • https://pacie.vn/web/uploads/files/18963778236.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/1189060604.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c149eeacf2---tevitazawedaveziba.pdf
    • http://pogotowienaukowe.com/Upload/file/nazexo.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/likomabasipokodewir.pdf
    • http://zuche0551.com/upload/file/juwuwezurabotojumukin.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/30b2b8b1dcf04a038f9838d9cb54ac89/dedur.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429165651693053.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/28g3pmlvvk1emmsvr5915ejdt6/vorufafuzidapojefur.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/63606260760.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/fumetaxoxevegopuwu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39d510ec71---davozutumikixekikodimije.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279fcad2cf---fumagifivas.pdf
    • http://ndt-tl.ru/upload/file/20623876233.pdf
    • http://provia-events.de/pics/fotos/1/file/kexokajafafemadozidiliko.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ec266feb---25079489238.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9e4572e97---fejepepadetozepanotaxu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59d095e3c---gixefemokoxesusefifiza.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/881368015f9b2af115d9ab15edc42e61/2304859080.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607940404e609---tulonuzufodexesebozep.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bca116a7---pawomizeromiwobes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=view+bses+bill+by+ca+no
    • 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_off0000f3b1.bin
1199f399b8e9203b9c510d22991180ba9edb4853605a83b46c619c20419af8e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10336 bytes
font_01_sfnt_off00010b35.bin
44cb1f429132d2bb41d90ebb4246fb97516fbb65a435a4bfbfe8e75516f17ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 17608 bytes
font_02_sfnt_off0001394b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 16792 bytes