Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d43f6c5a0b9f9d8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 11:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 070dcc14ec56f07986b39ef3a6e3e1b5 SHA-1: da8bf9723f15c896e60580a2baf4ba310d94b397 SHA-256: 6d43f6c5a0b9f9d80066093ba93de635d75b5add10d54d5151409381e2717de5
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to obscure the true destination, which could be a phishing page or a download for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00f04c760---1945972958.pdf
    • http://bettynblue.com/upload/fck_img/20210601/file/mugolofutewekelu.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ead69206a0099d909f335d47f6f4d688/29963472011.pdf
    • http://www.iece.in/userfiles/file/gulom.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e22a68f8e139b6810f96c1a664ba4b1e/galudopese.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f6d2eca4---44002500233.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/eb1ae83c88200aa29a22ba306d4c6c51/14089715591.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/45603895359.pdf
    • https://hr-serdahel.hu/images/file/23271647468.pdf
    • https://pet-fashion.ro/mm/file/guwapugo.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/740678232.pdf
    • http://gazosilikatnn.ru/uploads/files/gawolulewobuwutosoraju.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/xatatamurozemaxapapula.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/v6qln02qn8qbqvtbqeatmdcc6p/78519749216.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6d320223---vudizudorumitapezaf.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8e83d95fdd6dd82fbcb0a23c129ccae0/470044389.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da2b471a0---lesediv.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/lm38d3u7ekb8c9r347f3gqdef1/kuwevejepi.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/kexakenonijumuduxo.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160775f474ac6b---99297083585.pdf
    • https://eagle-aviation.com/userfiles/files/pepab.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/67192074585.pdf
    • http://sungsam.net/userData/board/file/mudijuga.pdf
    • http://bigredclassof1960.com/clients/879476/File/47540146484.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=li%C3%A7%C3%B5es+de+psicodrama+introdu%C3%A7%C3%A3o+ao+pensamento+de+jl+moreno+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_off0000db48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 16792 bytes
font_01_sfnt_off0000f35a.bin
39c737179cee98dafd6996ca206d938677bdd31a9e0950ef086cf1090ddfcfbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 20904 bytes
font_02_sfnt_off000127cb.bin
221fa86d33a7814bb78fffea29edf054d01af4d02848fa342691989ddade1e32
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 11656 bytes