Malicious PDF — malware analysis report

Static analysis result for SHA-256 54483a863cb4851b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 03:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33fa5b4f6326e74c08088678fdbac988 SHA-1: a1db57e03557efce2a446bc9a74ffea7f35f5cd1 SHA-256: 54483a863cb4851bfd6698ec6eb73fb7860e7f446c46ccdcb733b837a8d3e77c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as 'https://sujatasfoodopolis.com/ckfinder/userfiles/files/60017511181.pdf', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://sujatasfoodopolis.com/ckfinder/userfiles/files/60017511181.pdf
    • https://projekt-lesen.de/userfiles/file/jojapabezomex.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411dee8cdf6---21876289346.pdf
    • http://manavpublicschool.org/manav/userfiles/file/88220822646.pdf
    • http://oskarmak.com/userfiles/file/16830468331.pdf
    • http://sbnjl.com/userfiles/files/89516039972.pdf
    • http://mebelhotel.ru/userfiles/files/77032763901.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf06576dd---durazidonasikuk.pdf
    • http://eaas-journal.org/survey/userfiles/files/19699428119.pdf
    • http://americansemitruckparts.com/d/files/xozalefezarugirikazen.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656867629d---75376288135.pdf
    • http://skybuildinfraprojects.com/uploads/mimoj.pdf
    • http://iknow.pl/files/file/35967404517.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lic22kbs4u6v50gac0hh4vbeub/12457493298.pdf
    • http://insightonafrica.in/userfiles/file/68030872654.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/46091961170.pdf
    • http://sinproval.it/userfiles/files/mowigozire.pdf
    • http://archi-m.ru/userfiles/file/bilitorapenu.pdf
    • http://cpk.by/ckfinder/userfiles/files/11749186422.pdf
    • http://czechdidgeridoo.com/admin/upload/file/29480967824.pdf
    • http://dostrojar.sk/UserFiles/file/12969384113.pdf
    • http://launensia.cz/ckfinder/userfiles/files/21689453375.pdf
    • http://tc-antey.ru/uploads/files/12676130886.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/64434334639.pdf
    • https://cornerstonelaw.eu/userfiles/file/77882552004.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pvz+heroes+mod+apk+unlimited+gems
    • 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_off0000b77a.bin
c842b7864222499b98f75ceed773d3325f6f11a9c8339b051b5f503718d2e295
pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 19020 bytes
font_01_sfnt_off0000e87f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16792 bytes
font_02_sfnt_off00010096.bin
a858113487aa6324e0aad5fca8900ed335f3e9073863e8ae00d2d652a85ff591
pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 11156 bytes