Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ecb44678f99f14…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 00:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 237bd5b3ab37eac462743049da2e2f1c SHA-1: 2f867033dd36c6b07573dd457a4cd8fa65d0407e SHA-256: 66ecb44678f99f14f6448384621e15b89f6ee96399149daa60284e98dbb1aacc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=how+to+mix+black+oil+paint
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/947b853265f8174afbfec280b7937155/55254566928.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/454d127f90beb6e9dd34c46b804ad42d/rawoparu.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5a5ffacdaf0bef043d5e9d6ba216d608/69280584631.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f555689d9---59997694615.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5s43il6tueg5jg1qrh6bbh9p8k/91366572091.pdf
    • http://naturallabs.fr/userfiles/file/fijupewuxasupizavabiveru.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a57b1321f---banipaf.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3e43afc7---9853084023.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608875a04405f---54498646330.pdf
    • https://geneticapanama.com/userfiles/file/65600624905.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160974662df8a8---biferitegusexelowinuj.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/sufiraxig.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/456879775ad79108b9028d50d1eb0f7e/sumurojep.pdf
    • http://proxima-design.cz/files/file/buroxezev.pdf
    • http://ylphs.com/ckfinder/userfiles/files/nelivebuvenogi.pdf
    • http://x-site.by/upload/editor/files/92713959246.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1644b21c---wovedefalimilurenoguten.pdf
    • https://coluer.ir/documents/file/80467364578.pdf
    • http://eros-arena.de/eros/userfiles/file/gavoli.pdf
    • http://deauville.ru/files/file/totekitowopilapipusubumup.pdf
    • https://nevisnews.com/userfiles/85672878972.pdf
    • http://446888.top/userfiles/file/32352395935.pdf
    • https://inverpalmas.com/aym_image/files/pevuvusaxafamowabisilajam.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/44894188017.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_off0000f4cc.bin
f244a6afbea867a6d68f2edb49fee673703988978ff795a96144675e24aec4a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 18160 bytes
font_01_sfnt_off00012429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 16792 bytes
font_02_sfnt_off00013c40.bin
4f9f63bc9a0654fc724db34a6994f41739b7e7fbd751dfab77b32083dcf144ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 10548 bytes