Malicious PDF — malware analysis report

Static analysis result for SHA-256 596901b7ad91f8c0…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 15:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbe7b9b3b4c8c395e0c6c0839d296419 SHA-1: c2106828051ece657c424787b380d94e905df8aa SHA-256: 596901b7ad91f8c096fba6da9048dd60a3c3e5a50bfc613380201ac68cea22f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=business+systems+analysis
    • https://brs.jo/userfiles/files/6306628977.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607726cb5ed73---48409758445.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3a98769e---81339859251.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2adb2a09a7a323fec962b5f2c73dc8e8/18178518039.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cdc150f206c3109e7a10d6e5a954fd8/44816514532.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2a94eed0---gegokap.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/845b356451fe239aa72e529fc4e7cc88/monowebogurutefi.pdf
    • https://bruceleevideos.org/images/file/vopidi.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb59ce83c---tipufawemevos.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0ff44453---jesediruranisulozat.pdf
    • http://btc-ltd.com/upload/file/ripisipukerasagokejal.pdf
    • http://bigandtallking.com/userfiles/file/sepufasatis.pdf
    • http://daehwa.info/uploaded/file/98814870004.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3a6fda767473143325fc0642e69c7ba9/navaxipamuzusatabokuxizol.pdf
    • https://asthasupermarket.com/userfiles/file/lekevumoba.pdf
    • https://emauto.lv/index/images/up/file/gatepubigina.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/33520796765.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/29867240744.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79c46029e---ledazuladetejejo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59adac85c---82695281555.pdf
    • http://bezagsecurity.cz/userfiles/90841856936.pdf
    • http://stellarp.com/userfiles/files/lozibofegozali.pdf
    • https://ayurvedaemart.com/uploads/file/wolenarodudotagut.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8718beab33---gamilito.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961eae3915---zelib.pdf
    • 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_off0000ff2e.bin
f07df53640d9d44de5420e4888bda320056d6c87278eeeabacf9c5b0feb7cadb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16832 bytes
font_01_sfnt_off00012a6a.bin
15fa2cfb9cb317f86faa87e4d1e3b151982337287ec88c4389bf5d3a03baecf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 10316 bytes
font_02_sfnt_off000141b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 16792 bytes