Malicious PDF — malware analysis report

Static analysis result for SHA-256 c382a7ddb92caeaf…

MALICIOUS

PDF

96.9 KB Created: 2021-07-21 01:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94b476e3b6cb2dcf51e75d93132dd32c SHA-1: fbfcdfd2a697fa3a8d463f9ae9be8a917a471580 SHA-256: c382a7ddb92caeafdc30c5e0b37c8b85a62590cb17a6fa3d92b6fa67c87f986c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure itself appears to be a lure, with no readable document body content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bikavepukavoxalasoxomusa.pdf
    • https://mollis.rs//files/1178356837.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db61d81f025---wiwuremorumulelaxesijox.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a967b526---bujawewupumu.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160803fbb0e4c2---xipaxugifosapasibe.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc062ab803---97935275494.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/dodoku.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6bd7369e---romewetafoteludexotofun.pdf
    • http://hasdeu.md/data/userfiles/files/44200121960.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/22f7f473c05ae0b63e14ae53b6beaebc/77190516809.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb3add3e64---komemad.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6851d7e68---lijazeluzuxa.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/3ru1ooa8pkt52q1s33uuolo95h/narew.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/mozakuduninavetinefudumof.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/64720414690.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984af9daf47---35627806355.pdf
    • https://zemiigori.com/uploads/file/1293773116.pdf
    • http://grupopiscis.com/upload/files/69584053305.pdf
    • https://luminex.pl/upload/file/beketukesadas.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/55cb2dea230b44ad07279412fb0e8fea/xodidakitulimeludufojal.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/80676031362.pdf
    • http://aelma.com/sites/default/userfiles/file/soxosakozipitirovufo.pdf
    • https://sardavetri.it/userfiles/file/48201122192.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fa5933bfe93726327dd07c07c8655fbc/vejanojulagesafedaramirut.pdf
    • https://thefertilizerproductionline.com/d/files/xozuwuwezeroxu.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edd36c89425---xonogonijoxuwuwa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=waiting+for+god%27s+will
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039a.bin
ff7577dc083f4c265177b97c6e38cdfcf0cbfbd4a2fb3a5e44a09ae1f5789c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10512 bytes
font_01_sfnt_off00011b7d.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 16312 bytes
font_02_sfnt_off00013184.bin
297fc687c6f9be88bd32a8f802ad12adb71419dad92cde46c9cfa76f32be4ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 16932 bytes
font_03_sfnt_off00015dc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC8 16792 bytes