Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba925fa994dbf83…

MALICIOUS

PDF

93.7 KB Created: 2021-07-08 03:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6774c610a36c42523889753eaddb863 SHA-1: dcf6ad595370f6f234b577318bff07ab468a8e6a SHA-256: 6ba925fa994dbf832ccc6fe24fa749a6cb3c53b2bf9b97544881f3a5e7760593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ec5cfef358f56d7cf02a2e4ac7e41ee7/68239100631.pdf
    • https://holocaustresearch.pl/nowy/photo/file/80159491311.pdf
    • http://bociany.sk/media/file/42263940931.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/66346969488.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/76473890075.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/151471786dd3171b33e6618773eaba6e/8413783937.pdf
    • https://dolcezzecaffe.it/file/57668254711.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/87107978708.pdf
    • http://afghansolar.com/userfiles/file/65383219493.pdf
    • http://lahma.pl/_u/userfiles/file/ruwinobivogumosesimopaz.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/v1i2bt1n5cvv14p48md0tjab93/91143656.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079668fbc06a---vazove.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/858dd289a21c8745cabcd848236b9f76/pemewiwitegoriburozotoju.pdf
    • http://alhouti.com/userfiles/file/71936236935.pdf
    • http://thamdinhgiadaiquang.com/img/files/balalawesilaxilumo.pdf
    • https://dhcom.vn/userfiles/file/nuluwilululotaxuwozepor.pdf
    • https://zoldlepes.hu/userfiles/file/4686446830.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812287d2b55---10355142928.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad839b143---50120386602.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q79nakemk47ad0i1d6t3ue6us1/fojapezevasuwinuge.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5c50f3860---kerikaguwonudezenej.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/64cb8357fef86356300c403ff8b55aba/51393794110.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0601/06342b6aeddf5ada99fd88ee1a240f67.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c2e5349f59f436ecdc70028898dcb707/kixejurigujerafubo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+a+small+batch+of+whipped+cream
    • 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_off00010873.bin
84cea11db21266647016b38570ada153f91e0b797a720a2d025f37d55c309f71
pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 11092 bytes
font_01_sfnt_off00012211.bin
fc505aee546a8fef277e5b9c61b4d4c4ef445c4f6eae3c5acffa4b65007e209d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 17940 bytes
font_02_sfnt_off00015129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15129 16792 bytes