Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2a940170123f2a…

MALICIOUS

PDF

86.2 KB Created: 2021-07-30 00:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edb623b9cb8fc61247141ad7b4b5a9a7 SHA-1: 89e5c0b5ef550d20f406624a7540ac8859ec76be SHA-256: fb2a940170123f2a94fc682ad6a179a061e0a3ea4d75b9508231c7ac0c1adcd3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc171c6de---25613139486.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/l8abirtb9dbvno5fv76sjai6i3/53004236947.pdf
    • http://deepakbatteries.com/uploads/file/94791536177.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/23490943364.pdf
    • http://gapoom.com/upload/fckeditor/file/gurekan.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160876ee07ebe3---12660680358.pdf
    • http://akinmedical.com/uploads/file/69400530537.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d55685158234347f4e6c788029ea4e5/76614996048.pdf
    • http://forglass.sk/userfiles/file/91916113572.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8b2e76e57f7e95f9d73f63081d51c510/5239975227.pdf
    • http://krevue.cz/UserFiles/File/xapuletanozet.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c66e0d91f224e1c688dc50e5f883a281/penesorigenu.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/25111199276.pdf
    • http://jar-ted.pl/file/dadukusilotaredi.pdf
    • http://guitarenko.fr/img/files/54360826744.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210610_39BE26C8FD84D71B.pdf
    • https://villatoscana-pi.it/userfiles/file/nonikujozetiw.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/40298707231.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/35003501867.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a368819c3be7c69dc7816cd3d49aadd9/57832969352.pdf
    • http://climacom.eu/userfiles/files/jidadewinogafuvufikawuv.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/efbfceae3d37c2410607465d3990dcde/85011078715.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pop+songs+piano+chords+easy
    • 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_off0000e999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16792 bytes
font_01_sfnt_off000101ab.bin
266258550c4dd07b7097a733a48ebe8101f7391743dd6ae5bbdd92d0252a669e
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 18324 bytes
font_02_sfnt_off000131ff.bin
7201daa31a197fc0f97e67f572aeb154a4dcd1322152d3a31fbd1da521dacd1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 10764 bytes