Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6e7f762436581e…

MALICIOUS

PDF

78.9 KB Created: 2021-08-04 19:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fb810a23d9f686aea0c8b11bf83a2a8 SHA-1: 7bdcf1db9305176af58284cae5461cb25c7d5638 SHA-256: 8e6e7f762436581eea04c87d2e6f2f521a173b80ab3fc5106c6433a38ef444be
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=how+to+get+figure+8+fitness+on+roku PDF link annotation
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d3269daacba63cdca638a549132dc613/53888795016.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b61218662---27021707918.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///56970372338.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f285821b5f---70901591514.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/86115283858.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/vapemimikozobukebuga.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d941384272---41081778102.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985baf94483---3783798798.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/9763262919.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a960c3a650---64284636839.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707ece77684---ladiwif.pdfIn PDF document text
    • https://digireg.pl/upload/16658996553.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oo4e9f45bkgs48enpbktkf7r82/25410807231.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/63743794404.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/42619125852.pdfIn PDF document text
    • http://sivam.pl/files/file/54779758481.pdfIn PDF document text
    • http://partnercable.hu/files/kevawimimofufe.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/81882155102.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/3625419041.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609208a17c32d---92480295515.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/fa2fdf9f923b9eb2d3ff72ebf9291f75/28522113711.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754e8336ff---lunatof.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/18146757714.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 10660 bytes
SHA-256: ad0ae45d317f0d346fda0ad83479406290540a3b837109ab16ec21939510e85c

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