Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94cb284e22e2b60…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 10:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f40901cb64fd769cdf9927344458f78 SHA-1: 1b55b8a1f43525bda4b1db5fb53d09e587ad8a95 SHA-256: b94cb284e22e2b60b99719ecd4dd0ac08a5bfbc480359e41d92baa76c35116b4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://music-group-store.com/upload/files/84032576331.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/89886555452.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/42021217317.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082e26581e---12164986434.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c36a238aea8---91678533106.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088993c0047c---nasenogexowemagijopi.pdf
    • https://karapinler.com/calisma2/files/uploads/7006913133.pdf
    • http://a1climbing.com/userfiles/files/lotaxam.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/csoqfe18pend0rjgi8g0dg9r6f/dijezoxilu.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc2be729b6---58306352452.pdf
    • https://lysgaards.com/ckfinder/userfiles/files/57857005838.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/javalufisetutabonalasaju.pdf
    • http://didopack.com/files/68121105497.pdf
    • https://baigiangtoanhoc.com/upload/files/90920664333.pdf
    • https://cuacuonbentre.com/upload/files/91017052616.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/d15c9cd65335ed40a0573c1cc7c53bb7/kodazelazepabezazi.pdf
    • http://iltorg.ru/upload/file/kuxivovigagaforelel.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/jawiputojabiturufujiwuju.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3onbmsik1o18ijs0e2g0bl7ka0/12922929309.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926eb17336f---90961984549.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9eabddfe---66460679618.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/poraj.pdf
    • http://onnetsolution.in/userfiles/file/rojepopujagesuta.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/vewaxubulitadotisazobafu.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/runafolunex.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/jolugeridi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=metformina+para+bajar+de+peso+dosis+recomendada+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_off0000ecdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16792 bytes
font_01_sfnt_off000104f4.bin
9e3df7f602b826259fe4a742c0f56347e746f8d64eda09fa19f5038017915e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 11000 bytes
font_02_sfnt_off00011e3e.bin
06caaf8de613f6118b2f9d5a31f85f55a2e2af6ab961abcfb5e02f67742888d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 19080 bytes