Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8c8b1a365dfffa…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 12:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26a1151145b3b89233a26869732fa465 SHA-1: 634c728dedeb8b4306356df34b5694fbb0a79663 SHA-256: 8f8c8b1a365dfffabcbdcc56fb84c69c6697a0526a852889204e7734da94e012
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the interpretation of this PDF as a malicious link distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=adblock+extension+for+chrome+browser PDF link annotation
    • http://4x4autok.hu/userfiles/files/teguxadenomaxulodevep.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/ponirojos.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cebd373cbc8cb67464ffd73095a2272a/1411399578.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d324c21dcaa2d9d78a94df50d310c0cf/vasuwovezad.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/18891810098.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/63460294262.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/97c6039da0ee15d925aa651da5a31f74/29811286624.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/3753959643.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/3892354056.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/nofeduwapexovenodi.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/62001255048.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/tesepupaxeruxolomix.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ac35acfae---vezobawekewoxidon.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267bb3519c---62434855283.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/92423446720.pdfIn PDF document text
    • http://wernitznigg.at/files/tovumas.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xazidewobidux.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/22423916662.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/wolaj.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5gpu8bp2pm56adk49dkbkpdru1/26877548955.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/xazaxebexotej.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jinosebiviguxakova.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/21205941765.pdfIn PDF document text
    • 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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10980 bytes
SHA-256: 52fa06869b474462e3cb6d395fc04c76950c554a14420ade5f9dea25047fa4a8
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 19120 bytes
SHA-256: ffc7be6f6f0304d570d6ff7cec19b88ed39e7a1eb4ff1f69e31e0d66ddcda9f6
font_02_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1