Malicious PDF — malware analysis report

Static analysis result for SHA-256 346d9d6aecc6c275…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 16:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f6e44997dce6277af3b326610ef25a5 SHA-1: 27ac2a188a85b3a33ef47ebde1de0755d0f97230 SHA-256: 346d9d6aecc6c275f459e47e66b150c4f9258b8d75ed5756cacb8f3ab99513f7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links strongly suggest it is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://thekolkatapackersmovers.com/ckfinder/userfiles/files/3627588450.pdf
    • https://ntwbearing.com/UserFiles/File/fiwajunowujegibifej.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51b90f253---50411175290.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0mn9ua15drgbnl7rj13tmvuhp/kidolumivaregejamajilili.pdf
    • http://nesthomes.in/userfiles/file/65986491706.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7cf35645---femajirarisap.pdf
    • https://magatek.com/documents/file/77858465125.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2b00762eb4e4c14307374df428242fb4/norofikulerajetijugemufa.pdf
    • https://bitree.com/ckfinder/userfiles/files/60438590237.pdf
    • http://ural-resyrs.ru/data/file/43985192579.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/0643ivkh6lqkvfrrdehqnq48cn/xilimogijigoxukuvugexuk.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/98479217759.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/385433cd7a1b1d2bff36dbe1f19868e3/30165821659.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/86780307323.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bde0e487b---kokozunowarug.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rj5c0nlde6i1dncsv2026vvcv5/dowelusujuvataf.pdf
    • https://aduanaldelvalle.mx/userfiles/file/narituzaxefibi.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/076bd634e14a1482745a3a07777df058/46867458314.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=simple+minded+meaning
    • 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_off0000ea44.bin
6a6c927cad1ba058b639e09e5e71c20a1971d361405f068974b50780d77498f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 10324 bytes
font_01_sfnt_off00010139.bin
8421ff63428bbbae9ead3b18819b2f11d20d11bbf44b35f072c4dc504d098f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 17756 bytes
font_02_sfnt_off00012ff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 16792 bytes