Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceafc5ac9994b0e6…

MALICIOUS

PDF

86.5 KB Created: 2021-08-17 00:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62f80ed2ba35e66016384a885c706093 SHA-1: 321ceb5f035a282f19593a77775e33818573eeb2 SHA-256: ceafc5ac9994b0e642390fefabb24de9524fd34e2ca1b091f8b0b05e6ca032d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of 'utm_term' parameters suggest a phishing or SEO poisoning campaign to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=lemony+snicket+movie+watch+online+free PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160852112aad6e---77970122910.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/morodawapuliwibawixa.pdfIn PDF document text
    • https://arerp.kr/data/file///91544009505.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/wezozobikusupefulenawuta.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/rijamaxovafajirimamadupe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddb902ed0---sekevekemenevikeniluduvul.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hidmqadlanrc1qllqgb9gl7370/7501098111.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fe9cd55c---14914077356.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/rozufomaxopoxaxibazek.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1992c608d---51937718516.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/80459142563.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/90509809702.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/13171394629.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/91534626157.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/rusujem.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/zixarepibaxemutij.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b74168b3d2ecf665ce9074c5eec15ff4/lezamazasarofisimu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac88d716c---26862659882.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8l4mt84o53oi9fqnrdm95g5mj7/57363415836.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108170527222052.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/48851015132.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/zopiniwi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/ruvurafiwasaxujuxilil.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/75pn5jtgoqidt3t71ntapl79kt/85127877473.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/pamizasi.pdfIn PDF document text
    • 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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10916 bytes
SHA-256: bfb537423ca149d8fa2ca6fe47b15d9fb7110d354dc70de4d1c1e51220e4f047
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16768 bytes
SHA-256: 7034a40ca0b5bee266b8a1f3b848c8980dc6d13599552f45c40c2baa67e34c54
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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