Malicious PDF — malware analysis report

Static analysis result for SHA-256 945a35a7da10886f…

MALICIOUS

PDF

73.3 KB Created: 2021-06-29 15:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0093019a0c5834dc6ad327d775b8d56 SHA-1: 508aea907084bcbdf0565db781c1b8ad2a589658 SHA-256: 945a35a7da10886f8311dff7e8cb6a3675d7304ecd034d845c44bac2107fd9d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://egf.tw/test2/images/file/20948395441.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1f8d5247---zulemefomu.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/489c4f08f22383e864028478ef9ff92e/30575549698.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca4e59d66---31290655623.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa7d5862fa---tosakuwubufujaxube.pdf
    • http://ugrctrani.it/userfiles/files/85027516129.pdf
    • https://transmar.biz/ckfinder/userfiles/files/bawolosububupuwuwatu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91ec989a2---60657332007.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mfie26ng2pl241gf9tv2p1mt5v/goketedijiwazon.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d880d63595d7603560f27ca21998b825/dogilawufudak.pdf
    • http://doktor-okonski.pl/uploadimg/file/36084732442.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dcfc1327c---88074976687.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/37334786257.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/vopotasitetiwo.pdf
    • http://clairvoyantinfotech.com/demo/images/67786355290.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca9bdc4e2---70478786228.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b0f2fff1ba5cdc413900ea6a4da59717/ligovodadajewoko.pdf
    • http://pizzeriadevita.it/userfiles/files/43334692151.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/91dd059621be5bfebdbafffba044353c/povisonefusebamelon.pdf
    • https://boyanbolyarski.com/userfiles/file/50265070184.pdf
    • http://parkhighclassof60.com/clients/871169/File/85926321336.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99c55c834---xerirotujokazumigakudes.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/0d30b0bb86b0ab62a07b107825c72a04/tupanirovamokomewomal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=relational+model+example
    • 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_off0000bda0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 16792 bytes
font_01_sfnt_off0000d5b7.bin
6ec94afdd53ac1e338c7968bfa3198837179037908567ec93b02b76cf803d333
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 10432 bytes
font_02_sfnt_off0000ed4d.bin
45998597b4a5344a41579fd47006a74e2977ddaf0857bc774998fb3099a2be21
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16500 bytes