Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a6b1f724736bd7…

MALICIOUS

PDF

92.6 KB Created: 2021-08-01 10:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1bd1427f79a5ffe5975cf9ccab78a27b SHA-1: 8d5edaf95b4b75ed3e3e90fd70db6e33fb368acf SHA-256: d6a6b1f724736bd7e138b30567b441f387e6431e383ac8d7ca2eca5fd0f4a3ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://crescentcarpets.com/userfiles/file/dezunijisajopab.pdf In PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/pafijine.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/58297286485.pdfIn PDF document text
    • https://birotex.rs/images/files/18883950891.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b572182221d---36630992716.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b2a432cc---jasafurodozadimunavam.pdfIn PDF document text
    • http://anupbolivia.com/images/files/25292749957.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/luvuligivojilogutululop.pdfIn PDF document text
    • http://rc-modeller.se/images/file///43210709370.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/legitutobimubusufig.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79823390568.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/eoru4nun1lvsbqomb18jg8sjvh/geluliwobadenape.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/98333696280.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d04e3f2b59024712c85d70661adaada8/86033910179.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/foribezaz.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/xobad.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ef51idrhfrhqouk14dnurka2n8/73318489294.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/46161e05eb7e50cdb05867c4b4a7033e/39136048475.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/35095609257.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7d58feee3a9b594f78700e36b4d744dc/zubujamexiduzukenigagenuj.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/74385642169.pdfIn PDF document text
    • http://primaneighbors.com/userimages/zemigelekuwoxunar.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/41710250268.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/lipefonudoneta.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/85771560619.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae4c05b3c---85145276647.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/s37grra67j4p9p8sek06kgevee/422997489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=why+is+my+kidde+alarm+flashing+redPDF 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_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 17024 bytes
SHA-256: 3095d2cbb2ad684c64312dd24ac696e3caa9665d2f74913bfe7193a52c06db95
font_01_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 10780 bytes
SHA-256: 75cd924d70cb83149203d0bdb856b1813481550d83893504b328d293c710ba64
font_02_sfnt_off00014be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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