Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bd3f61f72875b9…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 02:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39a25ffc7ee3cab58e2103ee1f1497e3 SHA-1: 88da6a21425626c029a804f4e15463e3a263c0ed SHA-256: 76bd3f61f72875b98e687e543de390073d7d02d5ff6ca9c55b7255e542d50a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kasargod.net/uploads/file/vutaga.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cc0d9b15d752b31d2b7ba11ae76a99c5/suboxujo.pdf
    • http://bidmitt.com/img/files/file/tifogafela.pdf
    • https://alianzatours.com/imagenes/file/naremozodatojipezute.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6d6aa182b1a21c238011539d716600de/63607798356.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d66dd8f6b709e53ebb9b0475aca9cf88/33252939107.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5db87a12998750ceb8f60eca941c70e2/53974116925.pdf
    • http://tubietelbar.hu/uploadfile/jigajalaxisexifuluxoliko.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912195985c---26695141642.pdf
    • http://brenna-ski.pl/userfiles/file/20827397331.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c640e14b1e4bb63079554638705d8a9b/doferogoxagujusexigifi.pdf
    • http://marcth.pl/media/fck/file/56510281694.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fdb2d6c53---zafofomupavobufigekome.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7132372d67da3713e52ca672f4371ff1/zipelefi.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/20779975293.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f5cb62ef8---nufaba.pdf
    • http://bkdesign.ee/userfiles/file/jusowafidelenaxasi.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b4d02af4---mekinusokuz.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/60531516688.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/6177043049.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c4462d96---46468830408.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/33450390292.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef830d4357---85756263039.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1f180a1cbcedb42cba2d04d2f81e0e60/sotinixumoliwajisujosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tell+me+about+yourself+nursing+interview
    • 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_off0000e82c.bin
8606aa2417b98c8620fcd070633f6af584d8c54c3e95c5129b31480450a942bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 16280 bytes
font_01_sfnt_off000111e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 16792 bytes
font_02_sfnt_off000129ff.bin
931b5fb4198b4731c4340d68dab2f52b6c9734985f07322921d5323c838c4b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 11028 bytes