Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2645387136deee…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 06:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ab0cdca20e0f93101cedb8b1b31a929 SHA-1: de77da521b833d43c33d16a725e192e9016686f7 SHA-256: cd2645387136deeede725ccff4ede7b3d1ef75a8c22d42854f913f9b41770a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=the+5th+wave+2+the+infinite+sea+movie PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95f400340---85054018414.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/074caca4e07997c087ba04b8bad68ffb/riwade.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5330158c7bf830839632bdf1f2ba8375/37540417078.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/9545044153.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/demajuxakepadiraji.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/aa641cca3efa0c8ef5f34db86ed05cc0/fomupasawikerebekabir.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c456d112d3---61763646020.pdfIn PDF document text
    • http://aimic.com/userfiles/file/66408610185.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/fupokekuketojetifum.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608130ffc924b---lozefakega.pdfIn PDF document text
    • http://mesterek.net/tmp/loruzilabux.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/22608306293.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f8f8cbe09e032bf4f52f8aa877d5f020/kizonanulejesuralapodo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/70af5bb3904aca9930c4134e69d3abd6/wemilot.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69d35824c0---lawijiwepepoduxanusudixo.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/puzigitodegogevutu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f55dc42fc5720ebafd43add8a73a06c7/99769507751.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/634742a4929aea5cbbfaaf015dec5b52/wogepabojesijixomosedile.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kanoridabebikugimive.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/78397410804.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/6058041608.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075867ec10dd---12509186558.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/14991419215.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/15njr98gclqs9tr9shmfqtgkn6/60391070423.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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 18076 bytes
SHA-256: 2a0fa2c55cc38168c6c67fb96753496066b22047f3a2ee2f19f2cd0e0ddb1ffc
font_01_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 10700 bytes
SHA-256: 2dc6e2ed5a0e6956537a573301d82da7d781b242607922fd49fd8612f413615c
font_02_sfnt_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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