Malicious PDF — malware analysis report

Static analysis result for SHA-256 039720e27132a8eb…

MALICIOUS

PDF

90.2 KB Created: 2021-07-25 00:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07f960f0891900db7a25b835673a66a1 SHA-1: 396bea5718a097e084263aa66b70009bf8031d16 SHA-256: 039720e27132a8ebc7da9d2870de31e0b1db6edbe3f66dd5df209678c6edaa14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The presence of embedded URLs and the heuristic indicating a fake invoice lure support the conclusion that this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ff600d6d---5797095433.pdf In PDF document text
    • http://garderoba.sk/images/_file/motuxesujerowevomiz.pdfIn PDF document text
    • https://primer-spb.ru/files/files/88490681402.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/33680ab31858ee98c8c96eff405f086f/30295968365.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7286e27c5---82727375968.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3874839f06ef1e0d90964b3af9d7d954/butavibatanozavuzokug.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/67156583079.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/jeguwafavalosexenedub.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609610d1c3f7e---21625580800.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50fc96b0267af5040d29be65ba0006b0/553805122.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070407083589.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u29carhogat16ss2tosgdib3n2/suranorejefamanagubomup.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/85133239808.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/166f9bbf41ec4bca273e77564116ba0e/87289079422.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c92b0dc51---96562103785.pdfIn PDF document text
    • https://bczenekar.hu/files/file/41131613405.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/kt9k8k6siaroqhlerujb5o3vf3/kobunorubolipovi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd2d78b08e---betilibikinulumopojit.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8306f949---zilemakanibaviwutebajez.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/8490209825.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/17qvj4godrfgmid4n99j20stnl/fibulaniw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d126b707d---vadewovufikuzadibudut.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609860248fa75---jifeganogifedafujaritaj.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f6ef0a158caca5a386ce1e3f030a5b75/jumopogidigug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=which+annexure+is+required+for+minor+passport+in+indiaPDF 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_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 17632 bytes
SHA-256: a94ea17d110df0bc72097d82d86bd800fe10e6b4a3161045307ecdcaa733a299
font_01_sfnt_off00012890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 11180 bytes
SHA-256: 1beb956b29c377e81f33ff6214ed4b681020070354b92e6aa1bf7e1db749b998
font_02_sfnt_off00014262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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