Malicious PDF — malware analysis report

Static analysis result for SHA-256 91373522e2f189e7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-05 12:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb74be64d3f34ec9e9cc13b3892f0621 SHA-1: 1e0617fb43635478597d51b36dfaa1dac327669d SHA-256: 91373522e2f189e729a11546b8f8306bef047d5ad00df90dd0a5ebb7767b1aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/xokifotivut.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/04923bvmle3mtc4po45guek3o1/kuvojomadeliwuduvoz.pdf
    • http://holidayinntorino.com/userfiles/files/43614164378.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8qgehgk6vd9b4348dqgui8a5v0/99981044451.pdf
    • http://bestbelly.org/content/files/files/furijodip.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0a44bf04---52131157056.pdf
    • http://ahkjt.com/upfile/file/pafomisigox.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092110adcdb0---23204922587.pdf
    • http://mobilesamara.com/img/files/file/56371659635.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/f90kv53m049kbnsq9hij9toltq/71315128738.pdf
    • http://phongkhamducphuc.net/images/files/pivelagijovutezorufen.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e80c7b3d6ba8320c5ed3d8f9c95b1b4/61543626895.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56b30ed53---zikejelotigugide.pdf
    • http://2440027.ru/upload/file/dodebijibud.pdf
    • https://alixdemassy.fr/userfiles/file/zefiwodibar.pdf
    • http://englishplanet.info/ckfinder/userfiles/files/sulowemoke.pdf
    • https://toskov-yordanov.com/userfiles/file/wilejozepovaleropa.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bded5a30067---21629173146.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9kpbttgvetnmn9jaecinbabieh/63590178279.pdf
    • https://vandolderskb.com/images/usr/88758883537.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/90907669533.pdf
    • http://vmkmsz.hu/userfiles/file/39310868372.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mission+impossible+fallout+torrent
    • 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_off0000e92a.bin
77e1a61d112ebb857b8362549bff9df191dd453e5e3de1d4bc37c9543e757ca2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 18444 bytes
font_01_sfnt_off000119d4.bin
20ca23e28b5ecefa0881c40ec7698b47ea638cd48d30efd16c72463212ff56e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 10752 bytes
font_02_sfnt_off0001324b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 16792 bytes