Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae94410139f623a2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 12:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8f77fe44a4324ae5e8eff3037249da1 SHA-1: 0d515f6e3739a4ff51545ddf468fb84ec3693d5f SHA-256: ae94410139f623a231dcf9852062250dcf33742bcd14cae1206b8580b08a4555
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution point for phishing content or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b22e2845d---tozopowobot.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084b810196a6---vekusilerifatiden.pdf
    • http://erbamedica.org/userfiles/files/xitifirasivokamirumera.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vibubemaw.pdf
    • http://learningkey.org/userfiles/85964061218.pdf
    • https://parklanehotel.asia/userfiles/file/solixowelikigefexisowo.pdf
    • https://charterboatdeliverance.com/uploads/files/85245654402.pdf
    • http://2222.netsociality.com/upload/files/savolunetutej.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb621e1dad---50068206953.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n3oib8139fsqjtn94ttfjcfqvv/nozixukeve.pdf
    • http://change4best.ru/upload/file/sowowabeduvidos.pdf
    • https://datatech-int.com/userfiles/file/77542959508.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee224b8b6---93227855292.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/66294767987.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/919cbbf7d5425cd340bd1f36facee788/xivofilumuwumosunidu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed34c41e8b---32294046047.pdf
    • http://www.olivier-frey.ch/user/web/file/fidemoboxurifu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e1e89a5a---xanufu.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/1t5so2he7iq8ub55tff2o52c5u/59863113975.pdf
    • http://iscyber.com/userfiles/files/77208179152.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/73676310248.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/borevepad.pdf
    • http://akcjonariusz.com/UserFiles/file/mibox.pdf
    • http://humanitool.ru/userfiles/file/31227323374.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d3324d7b628bd0e541859387df065526/vovivuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=que+es+divisibilidad+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_off0000e070.bin
e8b493e00c926761b7c5e7b26058071eceb2210753f13dd2b469a0556d27feca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 19304 bytes
font_01_sfnt_off000111d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 16792 bytes
font_02_sfnt_off000129ea.bin
1d5760904dc7f93fabf9721c12b49ff8df98dbaab7af13bc0b9e054a7621a258
pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 10436 bytes