Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf6261be721580d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 06:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8499dc0b089269ceaedf7b333b8912b4 SHA-1: b7dd670fb8d91665b116fcf9ad1ed98cb3c1dbbc SHA-256: 6cf6261be721580dc8ee1c0f4acd0bed8e9effb3f12268ae4fbfe5e1c49948d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://itcbeautytrainingschool.com/userfiles/file/98711013123.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/si2n3if954oj7jkid6aa6jc0f0/borazixoteni.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/gukolujuraxelaluviwud.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/kusunanufobijukamuri.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134af8eda12f---kugaribazetuzugagus.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/12270740265.pdfIn PDF document text
    • http://schokozentrale.de/idata/repumof.pdfIn PDF document text
    • https://loyd.rs/images/file/bobavakepijofaguziwoked.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6lupql1nc0ua19ecsn81dfov40/59617312944.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/59687892906.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/datojelutovikijuxafu.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vewelamiwi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/24853173235.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/vejutugibatesux.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/27037102160.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/dukegavozopikar.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/funonekadeniga.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/68751308091.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/9138034738.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/xopipolak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+best+android+launcher+2020PDF 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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 10940 bytes
SHA-256: bb2473bab8c3383ab6fdd683bb8f3aa6196ac5bbf2f7a3c08a9b236eb230eb16
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 18012 bytes
SHA-256: f9121640082ede313080f3adc553ee5787ac6ad3d53b80fdf1692294ce6baa78
font_02_sfnt_off000137b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1