Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60109228acefa60…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 08:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78a47dc0b843e17f267b7dbaae420931 SHA-1: a9e4489a3c6800f8365ef56f9c26a4211e699920 SHA-256: a60109228acefa601e87b42437e3c5a980dab535a19db64d1af26d929e979123
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely lead to further malicious content or phishing pages, consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=codigo+de+etica+del+criminologo+en+mexico+pdf
    • http://lmleadmanagement.com/userfiles/files/manaximen.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0d26ee7---sikuboluropa.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/50383740434.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b49799376---80901424051.pdf
    • http://fredericjean.net/oplusco/file/18335763912.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/70357187388.pdf
    • https://cjsc.se/ckfinder/userfiles/files/31011906710.pdf
    • https://polandpools.com/contents/files/87120846835.pdf
    • http://drcleancenter.com/uploads/files/202109151957206066.pdf
    • https://cncunse.com/d/files/fekorujosoni.pdf
    • http://apismorava.eu/docs/sedimudidem.pdf
    • http://goldsunjsc.com/upload/files/jefiragim.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/8698744861.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/pifobupafalekawedolujom.pdf
    • http://associatedreclaimed.com/userfiles/files/mirapuzofebi.pdf
    • https://faktxeber.com/resimler/files/zusokizumapabuvefuvozo.pdf
    • https://youxsoft.com/uploads/files/jezivetuxeron.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadavipajubobupixo.pdf
    • https://ijieet.org/ckfinder/userfiles/files/16945739081.pdf
    • http://ityab.com/cache/fck_files/file/vilisabetuju.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413af7eb659---57270305228.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/89821974627.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/edb71c9d3b0c1c18b6914e54c5c7dbde/pumej.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_off0000de24.bin
345b730a4d47e9ea61a5ef136916f868909919ad204547b95292f85fbfee3ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 18112 bytes
font_01_sfnt_off00010bca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 16792 bytes
font_02_sfnt_off000123e1.bin
1f86f438be43221eade9823ba97830c49b4700f14871cf3a409439142939f2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 10928 bytes

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