Malicious PDF — malware analysis report

Static analysis result for SHA-256 825d91c418795172…

MALICIOUS

PDF

91.1 KB Created: 2021-09-18 14:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5dd20bf8c0955dee08c1d98ae01a6487 SHA-1: ccecbf32db6efb646acd3280eb7e1977e3c9b2ef SHA-256: 825d91c41879517256f4bed32128e291d6cd43c24c9e30e8999d81e6fecf0f9a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links aligns with a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145547fd74d6---86815612895.pdf In PDF document text
    • https://vnnc.vn/img-hdmedia/files/86337906184.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e869031ab0cafffa85f2395f1d1b88ab/52333026922.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/95175951823.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jineviluxokenizilofulusim.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ea4b3428a3bb5fa745e6627f61186985/vamupapiwi.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/xomoxumiwivuxasewekulero.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/21922358382.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb655d9226---jokinobuzujelox.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/norodibezobipipafajuwa.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tavesopakomudenereredumef.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/43373940912.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210907054716.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/wowuzimarubo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613de25d1e6b0---xizotatupixug.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///tosutologuzawidub.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/7034331511.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/87605345143.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/xasiwowo.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/zunugirulu.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/xuwekafizozafotorinumixe.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e4fdc9442---21350475418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bloons+td+5+multiplayerPDF 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_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 10956 bytes
SHA-256: 81ccc3bdcc18458c6f0db7ce74b6bd1fd20a44d8456e8b32314a7d11f8497a0f
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 20372 bytes
SHA-256: 03d8bd2cd00001be0466cafdf393190304a733a561ffb2519b01c2b400ded7e0
font_02_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1