Malicious PDF — malware analysis report

Static analysis result for SHA-256 356bd39c3acc09ca…

MALICIOUS

PDF

68.9 KB Created: 2021-05-13 20:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016b586d5f6749d7e843e110e96bdf5c SHA-1: dfef7ad5727bb3876b15ac9c659bcaf4498b64f3 SHA-256: 356bd39c3acc09ca2ccf4a128a6a4e713cdf662ba0fa8b730c68f99f9056240e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=agent+d%2527+escale+formation+sans+bac
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff4b4890a---fiwotowuvupararisu.pdf
    • http://travelport.pl/userfiles//file/suniropobesi.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h6bcjt0es7qdpmpejsr7eju5h9/tilezeminatopujil.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4001a9e72a4de19d753ffea0de115a7e/7639492329.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9dd8fe947e3a7a2ab8dae4634617ac96/vegopivewimuwuvaxu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v3epm3o7ji9ltrsko0pfk5tgn7/tafanarupulepab.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0d7ccdf9e98c47695deb318c4b7257aa/muluripeginaxisobivuk.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ge2a8rc843qp8vbo8mehng8831/xasesojed.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4b06286932154dcaef13942c46ce5cd0/nowevuvizanixu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759cb841ed8---67021504433.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/fmebb090tsn8mu4e4ail87vj3d/20424900555.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b89bc3fb1dbcdea3b12050ff36c2bf30/bilaronorik.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/918901dfe9b66961fc2727848e1f7f0e/23629315717.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e071a690f71f8149b7dfb5275a35755b/32877885555.pdf
    • http://nedirajtebosnu.net/userfiles/file/jafafuminorosopafuroketul.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a113dae04e8aa47dadcf5270eb754020/10800664432.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadc.bin
ffc34dbda3b28696cbd22687d4480dc1f2e31548ebf83375d3f73552aa811fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 5504 bytes
font_01_sfnt_off0000ed8b.bin
4f5720923d42ed5d2fefa7ef5989c4aafd3b283b5b00c637244f6b84de0d5d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 11700 bytes

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