Malicious PDF — malware analysis report

Static analysis result for SHA-256 210bbf22c71687f5…

MALICIOUS

PDF

94.2 KB Created: 2021-08-06 19:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53bc1cbe2537fd06d0e4e028f55d131c SHA-1: 967486cb9dd65908261ab8762ccbc5a51e8dc88b SHA-256: 210bbf22c71687f5a25b48ca8b5a7264a4bd0caf519a2e7c8d07259e7907164a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links to potentially compromised websites, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.hangmandigital.com/files/file/39493765299.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5221582bec---60264079675.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/73877214395.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43bfed0a9---ziporajejuwusisegemexid.pdfIn PDF document text
    • https://servicepapik.ro/files/pirupojesav.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/jixirifofixonotegugipe.pdfIn PDF document text
    • https://atl-50.com/files/file/23444402199.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/8583517395.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fc3420cd02e6f8e20cc5e41b78507f37/zikulejuzojowubugirego.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/mexan.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/14271987622.pdfIn PDF document text
    • http://didula.com/img/file/75591557828.pdfIn PDF document text
    • http://classtool.info/upload/files/gimajejaxifunajobabeto.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/41412376692.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7289328a23---52453154287.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/64304950592.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/topiva.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/22104897897.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e31fc56814e---bejabotederorod.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba56e6e4158---13009764414.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/34043708383.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/aab27ac229ccc897f951926fb9d05411/widir.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/56955450763.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/32411072701.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ou9uul5spdo9v4scso6d55rfvk/78647126471.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa5eccda8---34421850257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+%D1%84%D0%B8%D0%B7%D0%B8%D0%BA%D0%B0+%D1%81%D0%B1%D0%BE%D1%80%D0%BD%D0%B8%D0%BA+%D0%B7%D0%B0%D0%B4%D0%B0%D1%87+7-9+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BB%D1%83%D0%BA%D0%B0%D1%88%D0%B8%D0%BAPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 20832 bytes
SHA-256: 26e12c99cb82cc6f874f45f92bc1bbe9e9030e84fc9bd867b571b6422f39f023
font_01_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_03_sfnt_off00014d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D69 11200 bytes
SHA-256: 6c38d0e378365fc0247ca7faf0e54c2b71f4f437eec0944f19168f6d137d5706