Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdf67a160676bea…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 20:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 080e8850751b9b687602df063a045929 SHA-1: cf45a5ae41b5acb91de7a785ad970d48964870fd SHA-256: efdf67a160676bea85b1b55fdf83c4add76bc4347c34cb911c6016b1966d48ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to host or redirect to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=types+of+suture+stitches
    • http://ebslang.net/_UploadFile/Images/file/seseboxalugan.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b03e93c954f389c9d1eabbfdb909cb99/xobuzototugomowumetowepaj.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/338adf40b14342c3d1aa6c5ed5457e29/39047831831.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e4e9dc4d---gixemadudewapifojima.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd8c9f94a---kilomokaloteweribesusa.pdf
    • https://psychologgia.pl/Upload/file/rowodaposisifojawuk.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f170073e---bapukata.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/33317b1369085bb4814cb15a28c300c4/rudizoxafi.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4b935568e282167ee1bba752894d2015/vufojilozevesiwenevop.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7141d27---31500875322.pdf
    • https://aviatroglo.fr/IMG/file/wufebufo.pdf
    • http://goref.ru/files/file/tomuvenodojefekogelosi.pdf
    • http://giadinhlaurenso.org/upload/files/84858996000.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/samiwovifawiridir.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2kg44cqf1esb3g58ltpch01vr0/15437958791.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfefb02f9---vadureke.pdf
    • http://heninrealty.com/userfiles/files/kasonoworenebofifi.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946a97d263f---fawofo.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca42070c1a---37160301709.pdf
    • https://mn-lawfirm.com/box/userfiles/file/jaduk.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29e847a2b---15774030406.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/ludofukekibi.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986096c4f9e---kavawowizixun.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_off0000e869.bin
7ebf4ff16df598b7ca5e93a6424b45e05b81bb6c01622a0688fd26b0f8e18ade
pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 16380 bytes
font_01_sfnt_off000112e3.bin
969d29af683c073dad6d0308c951ef52020db2f271cd05be9fdcf1c16326c090
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10440 bytes
font_02_sfnt_off00012acd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes