Malicious PDF — malware analysis report

Static analysis result for SHA-256 984957dd9202aad9…

MALICIOUS

PDF

80.0 KB Created: 2021-07-04 11:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e8d7071977b3c9cade272e8c0e660c3 SHA-1: 8436df4c8e565fd92e310ea12609f0676648651c SHA-256: 984957dd9202aad9fea72275c06e2d315c637e03af8bf7ce37e9cf2704e0565a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages, serving as a lure to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8ad0b7fe---vazezidimumix.pdf
    • http://petrduchek.com/files/ramosirefirotim.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/jifowukulawet.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdf
    • http://birnagarcollege.in/userfiles/file/bejositomuv.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b07adc6b8f11fc8186cca20cdc4a7739/nemunuvitalelul.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6518ee2f44---witegujedomudimedafepug.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bcb5d607---48392573402.pdf
    • https://upbfassadenbau.com/upload/file/litiwitawokopogimetaj.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8386c7f179d4593531c6af974e87c2a1/kuxirozaxazesamaxunawe.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c006ffeab1f---89298696559.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c34d41537b31558c20343453744e0319/xudapaf.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gpdkm13a1cvc0bu10rs2qgrhj7/92977414724.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a388c8c06dd---70888499796.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/imd2t96lca58ce8m6vqlse9vj1/24584252134.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d87b9175---80187313889.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cc6693bac9f3854ee200d4debfbbf884/labipojojazesopigovo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c489d370437---90419378664.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ao3ulq9sv469p8m7lhu6cvoikl/xuzodilova.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a1b5043d---kamosu.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f848eedde1---65653970126.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/2601854938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=painted+canyon+cardigan
    • 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_off0000d51d.bin
471d5b436e63bf98b95dbccede14ea075fc5328bbc4f76303ac5524da510753b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 10448 bytes
font_01_sfnt_off0000ecbb.bin
ca5f649747175ec136646d72217d8984e4711c86c96f162ca367212732576272
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 17748 bytes
font_02_sfnt_off00011af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes