Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d99db87c084b3c…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 16:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cfec3d1d8a1cbb65637ac88eaa86d19 SHA-1: 93da2d137bd16352c143e8e9dda41989ef21e8b8 SHA-256: f8d99db87c084b3c5ac77cd65ccdce3dbc1352006c2def2907e556f82565daea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/117b0cca3989087cd6ee388e97a07d23/dafigibunepivevutarututub.pdf
    • http://nextgt.eu/uploads/file/jakemirowasesoloja.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97c6354b9---631352958.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5fd74beda2f204242ff1edc8f7d1922a/xisike.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/89v9rvnc26tan56ubu0tgd8v20/17488439986.pdf
    • https://baoholaodong24.com/userfiles/file/tadafazifixijijifozitis.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5179a37e---10751622849.pdf
    • https://tylbm.com/Upload/ckeditor/files/70194756607.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6950135ac22509f9539c5c76449ee82/rolisofegufivo.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/31452981335.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/cuc2n5o1709smqv6rmodqvjf0g/fegujinutoluralaribiget.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087784a40c81---13359075920.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c933a4060c---lezubid.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/320i2nc105vmtef65o3enqbaeq/51757482363.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c90a838f1---17593158993.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9f1fdcd65577828d268df1a1218374e0/76533405791.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c082445e60---megegadejimopinigujox.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7vv4c4h6579j3amd8oe5l44bsc/lufebejigepuzeparuxodase.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdbf8fce9---50393179703.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/kmg9talo7omganab50qvqd24j0/91020887895.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4bd3e0a3f6df5f77e1514b98a0f0e853/juzanufet.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/33140716590.pdf
    • https://plentis.eu/ckfinder/userfiles/files/55126518237.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e35566341bd5a4de168fc07913a35387/sakav.pdf
    • http://aklond.com/UploadFilesfile///2021060318552498.pdf
    • https://ive-cal.it/file/pezuxosatopezamuxalisaba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cunningham%27s+manual+of+practical+anatomy+pdf+free+download
    • 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_off0000ed98.bin
0afb22845b3a98b3820c49422aeb8653a633764b44072e54702d1c6396432b27
pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16980 bytes
font_01_sfnt_off000119cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
font_02_sfnt_off000131e2.bin
af42efa1197d05af1a03815cf78ffab970c3bf51fdbc2a1b664e143d88fc0624
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 11432 bytes