Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c20ef510284703b…

MALICIOUS

PDF

74.0 KB Created: 2021-07-02 20:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb0855b03e75e840f9584ae70947b8bd SHA-1: 03fe0faf2924a690529d03dfb7b282835395e70e SHA-256: 8c20ef510284703b93a38f83a527a8a6092b62890297fe3f8ad532848ccc6851
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other unknown domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070d636b9155---muwababuzizoli.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/75078037870.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe60d1301---dopadagolajokukadoro.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/gewumavimopiza.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869bcb96380---vujiporozew.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0a015308c7918ca54dd08267988ad343/vutekif.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/muvodu.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8227f47fb05af945562526ba34d957f6/natipubenaxiguduroso.pdf
    • https://alarouba.com/ckfinder/userfiles/files/22588090841.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dd422f92a---dubesufilagulanixawalib.pdf
    • http://huile-de-nigelle.info/userfiles/file/benupegumulizemule.pdf
    • https://walkandsmile.com/userfiles/file/tufetilusarakijebuvejad.pdf
    • https://bataretak.com/img/files/file/26334692393.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fbf89b5d---julakiliwosapovamorep.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb1c28ff8---leparokovegiga.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/juzusiv.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/zowosad.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h3pl349fsrd8h6t14dvcrrmb41/dovazepixezifunixirebuji.pdf
    • https://atamergranit.com/userfiles/file/28395004845.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51f3f2f3ac---xigifetuvekaxoniwuw.pdf
    • http://dinskayarealty.ru/media/file/51116414341.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121b0519f2---guwinipazelirodaj.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfeb36340---pejabowunoporaparas.pdf
    • http://erfaspot.com/resimler/files/8079362095.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/72968692677.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/271477528043c5d4007d5d4ff5e1f228/mukirilenipisivunogu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=things+to+do+once+baby+is+born
    • 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_off0000c1b4.bin
e670c7468ecc9678daa9b9d9f1b28f03bdd7f18c67f89a47cd1c31749aa44804
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B4 15672 bytes
font_01_sfnt_off0000e9f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 16792 bytes
font_02_sfnt_off00010209.bin
f4cc087300fbcde134827822c29f01d399a331bd095e620909042e3a4bdb6392
pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 10820 bytes