Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6cff66449e16f9…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 23:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f6a9e103e245938fe38b2572ff998a SHA-1: bb4b6117a875b73a7da2dd781049f970065e295f SHA-256: dd6cff66449e16f9234550af4a43bd7a277de1ab5338be4edbeb6b1743213c38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://wastran.ru/uplcv?utm_term=semiconductors+and+diodes+pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb52d71b8d---24710421549.pdf
    • http://adhdesign.de/userContent/files/20210607014743-tefajanidezelijinivoja.pdf
    • http://gildiamasterov.ru/userfiles/file/bitudivebederisujemu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a6cc7d71---mulelowe.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6fd4d89439f8a76bd3abc0c57c28cacb/96177383755.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kogunixavuwafigevuposebes.pdf
    • http://akicgiyim.com/userfiles/file/83844671937.pdf
    • http://waukeganeast1980.com/clients/877304/File/6429127500.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a36j7eisrkf2u8b1ces4407jd3/jowunamad.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc709704f0---matonil.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e5a333984a1f12d5361edeeb39c1ba68/zuvuvuxabule.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ikcrr0c90oncpkchhu02om7ckd/53057424665.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf43c7697---75304060664.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/50033298805.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/14027711645.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/701505bd4eaacecb9be2fbe42319cda5/wowamawinugujakoxonut.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/busiv.pdf
    • https://aimara-bg.com/userfiles/file/zapijumipuzabopeko.pdf
    • http://erex.hu/upload/file/xabazuwefezaki.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c23d0aa14be---miwijeriwivaroj.pdf
    • http://alshaabcoop.com/userfiles/file/witovirizusob.pdf
    • https://btegypt.com/file/66989583624.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/47da909f9916d80bc670bd919665bf85/tilopanifujomu.pdf
    • 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_off0000f352.bin
5088deec4eb9b9721287db2c51b6d4d387dd47bce587487a71b4b4443ccb190d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10908 bytes
font_01_sfnt_off00010c84.bin
2d3119e3ede15c545481ba8d3d20c22915ac6b443bb89bf29650a9f0e7c58743
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 17364 bytes
font_02_sfnt_off00013992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 16792 bytes