Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad5d09548c0172…

MALICIOUS

PDF

90.9 KB Created: 2021-07-08 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ff6193b61403ee84a10055a8ebf168c SHA-1: 5125347d56d7353571c6c185562b14b40007dbb4 SHA-256: c8ad5d09548c017214859cabe7af50945a02ebc08850a5e6377b096272d59e59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious payloads. Heuristics indicate the PDF itself is a link farm and has been flagged by ML classifiers and ClamAV as malicious. The presence of numerous unknown URLs associated with compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfc151858---tukuwok.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ielklvfsmot06l647hibjjfao4/diran.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2d6f2a43---rokor.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a094d11ef---kimamiparumutevamawewa.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa010081---43220377129.pdf
    • https://aimara-bg.com/userfiles/file/rasubezugimovuge.pdf
    • http://absolutelyneon.com/userfiles/file/setuwunulaxuvojemoli.pdf
    • http://jshtextile.com/UserFiles/file///riligisuwodel.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e630cc2d60---pivewosu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19edd050cf---dusoxa.pdf
    • http://przedszkolenisko.pl/userfiles/file/fabexufemavelesokurawor.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a99042625c49a61c74765f12326b596e/38869568999.pdf
    • http://forglory.cz/ckfinder/userfiles/files/gawivek.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/kugikumekixinutomiza.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b82f45faf---verakiduzo.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab619294581---jamugafafuxanujufu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098793acd4b3---50380264448.pdf
    • https://digireg.dk/upload/82240670256.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/drqp41ggp0c76cf82jk8us87co/dumuxibelamaje.pdf
    • http://interwork.sk/userfiles/file/lelevuweki.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/02336955164b865289bc4193257d58dc/juwimemafidilapo.pdf
    • http://planbmedia.hufiles/piminomitufezosomuliju.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54028873d---86234783321.pdf
    • http://hmconcretemixingplant.ru/d/files/rulebodomogutikomekipex.pdf
    • https://guijek.com/userfiles/file/66049130644.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+in+chilli+seasoning
    • 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_off0000ffcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes
font_01_sfnt_off000117df.bin
2fc9b051cbfa0d2ebf0b048e3d3ec6851864efcd854495a088120070f3fa713c
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 17784 bytes
font_02_sfnt_off000146b9.bin
1268e811a37ca4387f832405f971157727dcd91d72a134c070a508411b3ba4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B9 10404 bytes