Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b5e4431fa33d21…

MALICIOUS

PDF

93.7 KB Created: 2021-07-29 17:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 219983c6d11e251535c34e7cdf44220c SHA-1: 6f10e4eebff5a9e94fb743320f92b9ab2e2f74b1 SHA-256: 98b5e4431fa33d218e36b968b071d5fb63d5e69aa363fc9f21c6fda95fe0197d
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 upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pc-driver.ru/userfiles/files/61633724813.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/tuxofagokigotivezinakeril.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160701b0af1a4a---87615574696.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/36598384528.pdf
    • http://eternoohydro.com/d/files/58247077901.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8f34d2d2---setenirejozakobuvesevem.pdf
    • http://comlark.ru/userfiles/files/40360680941.pdf
    • https://sanaspinler.com/calisma2/files/uploads/xumodanikejupisuje.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b7055615bbf1a448aa96f2ad07a2c149/82567556407.pdf
    • http://hmconcretemixingplant.ru/d/files/pazozunowumodivatenusefen.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d973e456f9---88559639860.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/gsm0fhivefo0ddm13roju00e4n/35319052176.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1547ed8be---1397983975.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9cee96e1e8---40426431247.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d9e63d964f9acbecca9ef10afed3cb5c/27540629236.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9453733a---gezovobukalebenejofavi.pdf
    • http://megat.pl/uploaded/fck_files/file/12589391325.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/misuwux.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8ab69c78bd347b169c2950087e94e29f/12911295555.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b6108f28---zetizu.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607349866981c---43437762397.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/6epceno4176l1ngon84r9tntk3/47417848946.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255b578847---zutoligeromepepevorima.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+best+afro+beat
    • http://pro.ovh.net/~tribuene/images/banque/file/27058987262.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_off000108f3.bin
b953b82f2d4652df71eca0a7d52fdc70e7b600df066571df6e8c8a94993c715a
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10172 bytes
font_01_sfnt_off00011fe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 16792 bytes
font_02_sfnt_off000137f8.bin
0f363481d4203c0ec030f9779b21f3a706e3043c5da3140add5c280b04083801
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 18096 bytes