Malicious PDF — malware analysis report

Static analysis result for SHA-256 376735937a91e209…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 13:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ddc4560f4ba31d7ed38ee7681031f21 SHA-1: 46d8247d2578c4e621d1a62454ea8273497e6dde SHA-256: 376735937a91e209fa1ea24e6915138631abc2640008435a88b3d47369bd17c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, with the heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlighting the use of compromised WordPress upload storage for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://debden.org/userfiles/file/21548290981.pdf
    • https://summit-christian-academy.net/scauserfiles/files/47522875486.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdecdc4e8e3cee14ca8ab759e6014a3d/wurumusalinakaxof.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081276f7b639---24374489470.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/jenepunivobedonituwa.pdf
    • https://krassimirtaskov.com/userfiles/files/58456368557.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cff81eede---vobemafiwiribib.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/pagego.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40f30d8ac---58238769245.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/51d820de81265ed3c19facba4ae088c4/33977003218.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c431d501b1dd5ba5ea251957c77e30b6/99884778818.pdf
    • https://sanaspinler.com/calisma2/files/uploads/lofenisizuzojijufixiza.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4727e8f4---rotisaronumoxokovafeme.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16099a21d0673e---sokigizararazazilulu.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160864d937e8cc---ketosud.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afb49865825---juxejufufunobe.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210513220846.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6rvibvibcbsudgpbkrvdrgtc55/97266078846.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5210a298a7---19335880967.pdf
    • https://fallsplat.se/file/90772323363.pdf
    • http://macautemple.com/userfiles/file/wokididitaxezibufelafugo.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608406a572bb7---75814775288.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083df8dcc2c9---tawelidimulalepevuda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+internet+page+to+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_off0000f399.bin
f1fdc493e471da5ff272b27537854ea9abdf7c9fcc8b3f506a0f1cb0c6f53f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10556 bytes
font_01_sfnt_off00010b99.bin
3613867875c5646783930ba1c12d334945c9ecf9141fb2c23dd72535c27f9453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16972 bytes
font_02_sfnt_off000137b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 16792 bytes

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