Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe6f7e045c44233…

MALICIOUS

PDF

75.8 KB Created: 2021-08-18 09:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 074e8843a1a8ff1742432d6e4e1d40ce SHA-1: 7eaaf00cf4bb451703eb65bcdde4f96ffa9b1d2c SHA-256: cbe6f7e045c44233a5858b568cd8f35ed37ec4cf7d7464f2c14b4c8350a3ab89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6f90588c37fe33a3ac4a39c966622465/pokadudanisezumu.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6c827bbfeb345d7d99ba5d00b89c5961/14842383305.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vetoz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e19f0ab2c---166660425.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c1b075470---75720954221.pdfIn PDF document text
    • https://landbar.com/upload/files/momeziwelikafefizelopo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wabonuzaxuvajanusilite.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/guruge.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/69480296840.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/xelewonujekomujajojok.pdfIn PDF document text
    • http://devison-matras.com/upload/file/xikufewemomatoboser.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/riwuju.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/31227164555.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/82637462106.pdfIn PDF document text
    • https://hojoairport.com/images/file/gobemoximep.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/45688894534.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac8acf8e8---52911971275.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/66451589935.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d192e31b0df0985a890f344b4fd89cb9/kevudukogepiwozu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/42892206fb0093b24ca70b652e8df0a4/renevipofefoxegexumebaj.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nadanutafadebupoboxex.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080813c73b5f---41233661562.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/575628568.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/xoruwudawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=el+dador+de+suenos+bruce+wilkinson+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_off0000c1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F8 10916 bytes
SHA-256: 1cda74b0b4b4e2649cac2b972e3ec89dfb976a5330fe44948f385f9ca399be4e
font_01_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 17216 bytes
SHA-256: 5b9a91677680d0de7f9a2d6ce7e913f1ce822fba185d993114764aede607fa1b
font_02_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1