Malicious PDF — malware analysis report

Static analysis result for SHA-256 68076540bfa38410…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9da49464e5a18ae79f535cb58deca48 SHA-1: 6961769f6756fb1bb41ffafbebd444a9196aa06c SHA-256: 68076540bfa38410f5539bce39d1235eff76bac1357ca413759aa4153476b69c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d7524009b6bf9095d07e99c61cb9a91f/41560902965.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/44741720054.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beb9c966---butunesawekupedafaxidika.pdf
    • http://ansonseatery.com/uploads/files/lijaden.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9f7c7bf51964013a4cc7718144186315/25598371421.pdf
    • http://bhttourist.com/upload/fckimagesfile/68514062689.pdf
    • https://tradegateindia.com/userfiles/file/gakusunikatovizoni.pdf
    • https://gachbinhduong.com/upload/file/vebikitivikel.pdf
    • https://capitalsyndic.com/userfiles/file/36909086173.pdf
    • http://dooroc.com/tk/upload/file/95950045431.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/28314752988.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972e409ae13---semow.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/05be573ce7d035bc80a50938ffa6d8e5/zezawavulemaxa.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8beb6e604a---luditole.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/96591814745.pdf
    • http://biurod9.pl/public/userfiles/file/42594115975.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c607910439---guxisukinapapi.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/20188592949.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071658f40160---53749516227.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161129f4ca578d---66508041017.pdf
    • https://kovtec.pl/eurostyl/photos/file/10179594692.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d9a5a2070---98995004873.pdf
    • http://se-ty.ru/uploads/userfiles/file/16632396278.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=motivational+speech+text+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_off0000d710.bin
9178ed8c60c6f9daa25ed6bbbc644d40d5ccd09bc641040ed1a3cf975e044e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 16892 bytes
font_01_sfnt_off00010302.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16792 bytes
font_02_sfnt_off00011b19.bin
8074b89893fce14f07690813da27f5b6c433ae1f49a1f8ecb4d9e33c8fe27bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 10780 bytes