Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6ac72a3a786b2d…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 15:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca276d3bbf01e4730eceeea2fbce7abc SHA-1: 3ccd75a2dc9d272cec5b94e6c91e70e6f3eff00a SHA-256: fc6ac72a3a786b2db445b2b6e0e28a090b76e8e70e24c7e6e797c741ec71f8db
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://taevlingar.se/images/pages/file/napemagi.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d652773f4f---xigupugejonatusisegatijan.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2961d93b5---laridesubarafut.pdf
    • http://quickvideo.nl/userfiles/file/sofivaraw.pdf
    • http://grupophi.es/uploads/files/79235684606.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eef10981d---51243561158.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e8b2a4451fc2436a2cf0fbe7e1decbf/vixisiv.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vq34e6j1r819aot20a56lib3s9/majabuveruvu.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714240a28f0---matezilojisemodajifati.pdf
    • http://adance0112.com/upfile/editor/file/64617347333.pdf
    • https://zulapin.com/calisma2/files/uploads/65844711352.pdf
    • http://resortvillairene.it/userfiles/files/72839208944.pdf
    • http://garantc.ru/userfiles/file/dakoxutaza.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc0d680dc---62439627615.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6a226969---wutilajeki.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8dc630a151d40700019e4d92c3b602f0/9577831856.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i5h6bemt7v0lo9qt761c9qv1jl/saduvu.pdf
    • http://apsara.ru/userfiles/file/devadikofoz.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/62eca30421987f3a4bf3e457fc5f9051/kujotanu.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1894e01b228f73836297751a7a97befb/42270761117.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2e97365e---46812710045.pdf
    • https://smobiil.eu/userfiles/files/73642152754.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/nl6lhgdnql4b7elinrpf47s2tr/66292740185.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+java+projects+with+source+code
    • 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_off0000f982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 16792 bytes
font_01_sfnt_off00011199.bin
b5ad201660845ceb4e68709b7aea37503cf61f030d27b7f5893ddb7db2812627
pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 10820 bytes
font_02_sfnt_off00012ab5.bin
f128da4eb75948a472d528faa5930a0229424096536b10caa90263c9cb5c26ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 17152 bytes