Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab83dbffaf00b5f…

MALICIOUS

PDF

82.1 KB Created: 2021-06-25 22:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62d52b13146f6b0307752ec645465d64 SHA-1: 1e2c34877c8161a970a279ba2141ea7d9337ed54 SHA-256: 9ab83dbffaf00b5f38543c7e4e94d97609259161c80ce3659109f1f89db445ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i9g3jftsr1k8bphsafbu5sjcv3/pilulixejo.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af97936865f---4972238234.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94437f41f8---77912640382.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f727a2dd86---57895126015.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/riwizopujonupoga.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d48e82296---30086297916.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a0733503a8a---87497792395.pdf
    • https://amblamy.ee/upload/file/25342248532.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/aad3368b06410d0f1820c9061653dc77/20696739661.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cg9obua2o3h59lk49oj0i7kig5/faroxulotavezelabufana.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/03ts76ltdpuvrbkq90hqvdp161/6174813391.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c876357777f---vazuzofebuweturelux.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/131b0b2c08b6890a9c1fd9894a63468c/pubivupuridepewizo.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e32608ec---winapapu.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a0b58b6454ba42e885e4ca81dca4d538/55940342683.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a1d699c4---rowugokarinusavozavu.pdf
    • http://www.aqsclimited.com/EditorImages/file/67446220867.pdf
    • http://berbun.com/user_img/file/72649207033.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1996bd95b9---3345305308.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5qt3vp6pqc399assnk5266fvt2/vomosesemekupawosowodakov.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05823d393f87748d6a2cad0f0a83c4d2/53120560098.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6ad5dcf9---lufovizukesitim.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i41t61hs5tac0ns3s6dse3ito2/49209731148.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95cb62803---5361244729.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wuthering+heights+1985
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e4.bin
fcd30f1d66ea0ef85d4d0f95aec3496fbb681cda737b4d3c9469677927310147
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 10716 bytes
font_01_sfnt_off0000e08c.bin
bf2c81bdfac600e4116965c6dae541f89525df90e840a5ed7ce8803c5ea757e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 17260 bytes
font_02_sfnt_off00010d5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 16792 bytes
font_03_sfnt_off0001256c.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16068 bytes