Malicious PDF — malware analysis report

Static analysis result for SHA-256 5831a005a343a258…

MALICIOUS

PDF

100.7 KB Created: 2021-07-31 21:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cdb4172891c298358033595a11162ae9 SHA-1: eb08e92a24b1f97955a0af05f194755ca6068f96 SHA-256: 5831a005a343a2587ae9c737f043d21ccf2330ca852d59174dc125759fab2727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jejakefefolokega.pdf In PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/effcac5a5ce3601ea421d18105facdaf/10826924527.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/47359088995.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/85967130161.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9656392c91fcc7db3d9cb3d816b182bb/82263683187.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/ragifutigeropilefekex.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/butulujixuxevo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/69742599020.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8fd9cece1---72587586107.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kupexajibevawuke.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b9436eed9---memexopajujataka.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80b2cc47---95005518814.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6505c8919d0b932ee872ad69afc756aa/81556072517.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/33015807735.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/tenasilasiwabowisimug.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e1f7417655ac431b63de78f2b9394c54/61227900495.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/27a0d212816fe7eb4e5a2ea365bf49af/93019869972.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/78750527711.pdfIn PDF document text
    • https://egf.tw/test2/images/file/6123383745.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/amjpbttvofbbsqq51gu5rngks6/96129704083.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/76570266330.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c145bfdaa8d1984036e797268c824d39/1030817534.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/14510794606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=master+p+guinness+book+of+world+recordsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 11204 bytes
SHA-256: 0e8facc042ef369815b47c84b175a1b1fc89ff4158f7f47c4ea76e91d386eb0c
font_01_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 17916 bytes
SHA-256: e4fb335e21a5d728d7df3200cb141af194fbe8828ff5ac61815bf91ee27f39d9
font_02_sfnt_off00016c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1