Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aefd755dd71f72f…

MALICIOUS

PDF

76.7 KB Created: 2021-06-25 19:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d83b1450cc78dac3a1904339d2113d11 SHA-1: 052fc392f0045fc3e27aa8301a339d857ace6d62 SHA-256: 6aefd755dd71f72ff30204717268124730c6cab5eca053b21fc112eb364bf900
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malicious content or visiting phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://normel.org/files/upload/file/69471460853.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79f401b0d---91273268772.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ppbvki975jgmc6cn4qoifci7sh/884765952.pdf
    • http://groupkaishan.com/d/files/futopulipekekewomevumudej.pdf
    • http://bagiez.com/userfiles/file/12941503323.pdf
    • https://planet-pvc.com/upload/files/79537844698.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5810db6b9---81757688782.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/378b2530d98dc31086126e4da5873601/68238820980.pdf
    • http://fkhd.cz/data/img/gugomililabaros.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/xogoxedoz.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac861ebab84---figudosolowid.pdf
    • http://amadpich.com/userfiles/file/19090235659.pdf
    • http://lamelove-zakryti.cz/userfiles/file/30143874762.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607644224ae63---fomerokuboga.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/6323422241.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/moxisumediboxomezabiw.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c724f0246d---rameresojugudupu.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/22489299626.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/mimubekukosa.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc8c56bc0---43668152586.pdf
    • https://mongolia-volkslift.com/uploads/files/nasemisuratebogorokizoku.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/51432841217.pdf
    • https://inifd.london/uploads/file/papufifaduvofokozoxeseru.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a7un6sejtdhvtmn6444ge03f25/dadoli.pdf
    • https://alternativecarrepair.com/userfiles/file/87853010142.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e8349387---wimaze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=parmanu+full+movie+online+watch
    • 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_off0000c9a2.bin
0b05ad0038979d3635ae11371ea5bda721ea722d58d0790f99056c3b8c78b642
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 16620 bytes
font_01_sfnt_off0000f4cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 16792 bytes
font_02_sfnt_off00010ce2.bin
9ad0f16d3755bcb677c4a5dcff45fa3e9850cd9d3ce135852c129aa8fd6acaed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10688 bytes