Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b93d110f65792c…

MALICIOUS

PDF

88.6 KB Created: 2021-07-09 03:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb8e50af028ffe530f9df39125897469 SHA-1: 6620d52596008b8a9bd5a4883da4d4d837138cea SHA-256: 16b93d110f65792c0664c2b7381be00ff0337ad76aca4e5daa4d801a8c34c5fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

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 http://olympusflights.com/files/files/29375300508.pdf
    • http://kleiberit.ru/files/file/30894315256.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/sufusabagom.pdf
    • http://sosnovgeo.ru/userfiles/file/47718986315.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c736290e7ca---14202961811.pdf
    • http://poltinka.ru/userfiles/file/korusokujenabapovowisiki.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/98e979baff45d9057a80ff21a3bfabfe/53011743977.pdf
    • http://skogsformedling.se/bilder_umeny/File/78623230842.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ejumat45au70ggd2unqlhdn209/bepoxulowazufedikawu.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b570f55b0e05e092401f59574f058edf/xukufesam.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a35358ec2---newejoganagok.pdf
    • http://staresecurity.com/userfiles/file/lupudataka.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb396120222938cf4918c2ef30057347/38874402266.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/78136520961.pdf
    • https://carlojans.com/cms/file/sufisopesi.pdf
    • https://zhbiotech.com/CKEdit/upload/files/78292633267.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b3aac75e---suvezopi.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c884805fb7f---94079100757.pdf
    • https://theatresaucinema.fr/uploads/file/bapemuviva.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/61022605071.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/378747fecad8ba003c67a3b082c99a72/zusiralumatiwawejipigokad.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46b29c2d70def479bbd02951841f4932/vuwoloma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=blair+witch+house+burkittsville+maryland
    • 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_off0000f764.bin
88b7758465e5d89e6171cbaebcbc73360b1e29a1ba1e2e6f213e85c39fc10ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16608 bytes
font_01_sfnt_off000122a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 16792 bytes
font_02_sfnt_off00013ab9.bin
e81acf19e42b174b1bcbe83f8653ca33ccab68e3cf62d244e0e26510993e4574
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 11288 bytes