Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e53415bd697c08…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 10:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bc0c4b7ec85fdd441e7490da297be99 SHA-1: fc01ae566a1b8eb3ab4c51f116e7c7e8e3e764f5 SHA-256: a6e53415bd697c08d973776ec23b82edac894b181556efad46ccbf4682156acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to evade detection and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1631db9ee---76518519738.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c07dd38fed---jabokudodebobipevugeb.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63ff6a9eff5c6a799c34b057d3924eb5/72795861822.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/41t082ujvidunk9nohf4pcdask/27726285554.pdfIn PDF document text
    • http://le383.com/uploads/files/9526007308.pdfIn PDF document text
    • http://dalaichau.com/files/farisupomabozom.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/db8bbf0qcrh4ir00hjc0sj0ghu/31564656457.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3037f2fbc0---gavutesutojisagex.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/26315361606.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/9204972568.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/77024759047.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/lezimomigeruvapi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/eca09d1b6063326432031b28cbf96f27/mekevurese.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/71777822950.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/72660655080.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/febadojigezujagedagu.pdfIn PDF document text
    • http://pk-kuepfer.ch/ckfinder/userfiles/files/44709647049.pdfIn PDF document text
    • https://emenu.hu/editor_up/zikinuxetikuxuxozax.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/gifogoguneb.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a6bb6ec2---duresedili.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7b98ce41549cf4af279b902d7443e077/jorusikiwibixifogunini.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/dae19843c1d5eafda325891eb4c87a67/51496672493.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd68784921b18530fe7b53dce633a1f7/87804912984.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44853821025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=estructuras+metalicas+fratelli+pdfPDF 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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 10640 bytes
SHA-256: b3d7ddd66be679d0b09984b93dd3432d317aad499723a7f7a511880443e7d4a3
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 17600 bytes
SHA-256: c033cd4e1683c729c1d4b8e27575bfb6d9f4d07c6e862981b8d652fcc7389ef1
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1