Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1c58af4bacd954…

MALICIOUS

PDF

95.2 KB Created: 2021-07-17 06:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0341e10b8768a3baddc6b9b804e1f6c5 SHA-1: 08c31f1fedee7c857795fbc1b6003ac83858a8e1 SHA-256: 8b1c58af4bacd9549dd3f04803cbaa04e7b4348f2de3017c93947e4d323db389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, directing users to download other PDF files from compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially malicious PDFs suggests an attempt to deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a13d951f24---17881575038.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096772195529---xinugelowijuxitivumivim.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/582db0a115403bc805c1f07270e9be53/niwefotolalujiginu.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3932c2c7f8667354adb761e4ffcee828/juporepinupirefarubofe.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7bad4a7bf59432178c0d417717ef6b74/82427255164.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e750c03d23---19806947017.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f61a5103f---pikagexokosukuwitunazira.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7d1517a31d2ee3ce53ca439d24c41179/raxuriza.pdf
    • https://aljuboori.com/userfiles/files/kadibugarof.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609855b72ae6f---mituwezupakefomemugimiti.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d784771a759---xokemupoxab.pdf
    • https://tavcam.com/upload/ckfinder/files/ruwuled.pdf
    • http://golden-candies.ru/webroot/files/files/37019181349.pdf
    • http://mousike.it/img_ins/files/tujolefotad.pdf
    • http://e-district.org/userfiles/file/79479721287.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ou99ajhtoggdo849h7qi65n7o/12626868124.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/58fr91fb5lkksettkchvq9nqg5/2409292568.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c41697d05e0---bugodupos.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5uk3mtqv7dfqatlbj6d14t8bo8/25199557098.pdf
    • http://dakmet.pl/upload/vivanometolefinamuwopur.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0aa13c9d5---43098234796.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/3r6d1thr6m3j40g1bf4rkbmtun/26429473485.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7987795fa8---jonix.pdf
    • http://files.ibiza-ferien.de/file/wamodunijux.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/isq2acc8k59sg9g2mkbdhh9703/ribitijadopawurovudefumuv.pdf
    • https://alate.org/admin/fckeditor/editorfile/xurozigozop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+purpose+of+the+concluding+paragraph
    • 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_off0000fa84.bin
6a6c96f1809f96c3f7099909610aa45e9313e45a31be17de08ccabf16172cca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 17300 bytes
font_01_sfnt_off00012789.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 16792 bytes
font_02_sfnt_off00013fa0.bin
c11c43772b921e31dfee3a73362a6ec405d960c3721581e48b0bedeab9924496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 10992 bytes
font_03_sfnt_off000158e5.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158E5 16252 bytes

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