Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0ce39b845a610d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 21:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6757cde0120fdc930a2e5aa4cd68b46e SHA-1: 48a663a8b4201ad4d6569e108a4fb3a4fec3e4de SHA-256: 5f0ce39b845a610d2c89787f7b89865857fc8bb63b97aac3bb7cdcbaacd36f99
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including those using WordPress CMS uploads. The primary function appears to be directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://moto-trend.cz/public/files/fck/file/94882010198.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q5spcrfee3sk7445eklo3b3a3k/60307817216.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609401cc1da72---lizad.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/taludamigedoxawiveginogax.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fejimokubowalosu.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/ledudano.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/50878438467.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb872c18de---68621287750.pdfIn PDF document text
    • http://omgdoctors.com/php/billboard/uploads/file/jogaret.pdfIn PDF document text
    • http://temple.mo/userfiles/file/bupijesufeg.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c824d372640307ccdc450b6456fa1904/70776779034.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/aca62e2a960313e8954fb90d641ec102/rebaxepalefilujozurop.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0pkm5051bmfbs887hoaol52ar7/16974329892.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8stkqk8eucls8euhhndnjq02h7/tagujokizowikifujaka.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad6d4bfb---xotokamekosowomabuxedatol.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/dajekoga.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/16934531077.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3daa80b6e6333453c0b3c3df6e280624/66996523930.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/26055036411.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/25807560604.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609d894bb61a5---17162806013.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f2550e81e27f6989f04f7d2d10a1901/vefuvidafe.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/2105160533492950483gfyayxjgi0r.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/61083966956.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af079e0e95---momejinetami.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/jixaramarugisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=frosty+the+snowman+easy+piano+sheet+music+pdfPDF 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_off0000be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE21 16364 bytes
SHA-256: 4952a85c1e0b5dd585ad5198b3dbaa6ae199a830b5fb2f3b7146c688164a2480
font_01_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 11116 bytes
SHA-256: 0107ae74d0c73d97cb13dc5a80c3ebc5753a7b763767b54900caf828d3e385ed