Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e237caf9fbcd154…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 21:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eab48319d0524bb6721a2b4fa094ba2e SHA-1: 13bf4d8f8cb41146f102353673490250d9bfc0a5 SHA-256: 5e237caf9fbcd15449c92ffc298e8b69e77b3fd1bc78f3cbdc15f917aa13a5ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9e4b5731---dofizezitujedaporux.pdf, are indicative of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://sochi-riba.ru/ckfinder/userfiles/files/ratizawejixugiwumeziwav.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7f0cabe6---jafusepapa.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/49851283581.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/vaxopoxunege.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/8323235066.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/nazamifutanofed.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///weritidilevu.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/4962929270.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/funemudi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/senutijijuf.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/peruj.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/xufubazirevalotolivemufux.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/87891487377.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/98840970811.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/31316377548.pdfIn PDF document text
    • http://pronobile.com/catalog/file/77470971011.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/94880510219.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/73914673077.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/24e0947dcd56ed9f1fca120a7c8fae1a/sakipem.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/ravutol.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/kewafudanudofumejikamuk.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9e4b5731---dofizezitujedaporux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=evolution+x+poco+f2+proPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBB 14792 bytes
SHA-256: 6f9fc4e51efd6fafc9057ccb885601e382287aaf16af75dc84f78226bc2fdaf3
font_01_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10384 bytes
SHA-256: f807660769b54699024c852b92b02b0e87a7363733f290ce5150abb34645897e