Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a7c6913a0a183a…

MALICIOUS

PDF

76.1 KB Created: 2021-07-03 13:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57e4e591ac8fc121839fc94ca1f43a37 SHA-1: e56908911067d451334f5a4bcbd7a16a3be00a41 SHA-256: 98a7c6913a0a183a2dfe9ef8d85e323867184e8fc64ceb63993fab6654778693
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The structure and numerous external links are characteristic of a malicious PDF used to lure victims to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f3fdea576f83be5fd5c479ab6d94040b/70335652409.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5efbd9f5a2---63836607422.pdf
    • https://vieclamkinhdoanh247.com/upload/files/meluzuzuxupafokexivik.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/28038189396.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd378b3a6c---59651749939.pdf
    • http://dobrasekacka.cz/userfiles/file/45034189.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/suvitikizebinaxikafun.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853f9a51ae---20430274332.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9144bf238381176a36f4ffcad8f54e88/vafitulimewefu.pdf
    • http://myredm.ru/uploads/file/90373700869.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d386828681cd86a5d977c06ed57c934b/27994334251.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5772fc09ae74bae8ceb10c65d4f6bac5/rinurizemurepus.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd28d0dcb0---xezisavewepokimep.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/46496756829.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6885e076f3---89623793308.pdf
    • https://syntellect.ru/Repository/file/divatokanemizijewixikuso.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/791df97be6c4727ec5203964940a9524/70623199422.pdf
    • http://espacioschillout.es/images/admin/file/pigaw.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4b7c3130851882d3cf2c0f6766cafa6a/27182517764.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7ee07f3c---36466930877.pdf
    • http://rauvuonsach.com/images/uploads/files/fipunuzeb.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8d0d4b4d---76819543396.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/87682f2a3ceb8bbed65f4ba2055e754f/83323472007.pdf
    • https://daaeportrett.no/upload/file/tazewubipotuxudatozox.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1423a7e8---dopavobekaw.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b094ce2cedd---nawumapesilifawimi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cask+and+kiln
    • 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_off0000c982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 16792 bytes
font_01_sfnt_off0000e198.bin
64f49ca9e54775f79c76496357a89d0145688bbd00b5ebfb4bc509a922dfd501
pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 9916 bytes
font_02_sfnt_off0000f782.bin
5d1764db6964c602a258f53169a4816a06cccd34aa40cc932c99cd58d6334fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16864 bytes