Malicious PDF — malware analysis report

Static analysis result for SHA-256 e541edadc963f698…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 09:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a6ae4696a4b85f9597fd1bfc09b09a2 SHA-1: bfd78628b0204c77dd7dc8c1329250eb9e899786 SHA-256: e541edadc963f698ed7fa7414a60a6b02fdb159f74355128fe397c45da4e471e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bbgpiti.com/userfiles/files/soruxamofewimugenof.pdf In PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/73862392751.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/bomodoxurutagonuvapifukiv.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d438548a6a---jawegufavupeluwekosiri.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/rafunadaruteposaza.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5617644862.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/wobudalebije.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/78678676129.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/surirufexosuvonufoxefe.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0de6a660a35595912ec4ed9a338ddae9/31755450957.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210526215229.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/11613409169.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d25e527d73---rirelopetikebakefaraz.pdfIn PDF document text
    • http://poorclarescork.ie/images/zikapivakine.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/51abfdd4ebc4ae26e198e758e60275e6/lonokikuserozo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e94envv28g2s1hl6eklks32din/zefupabomikuzuziwiruf.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fpke8ahd4e206h07kk6hffm430/54666629269.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u48c0itudkjn919e84tupcqrh1/divexebovoz.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/64142176893.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088750414d27---62946514875.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/n53fcs9k1lvnmm2mj3vg8b6qvl/54396336675.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vosukavevotomazewu.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/63034549019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+boost+your+snap+score+fastPDF 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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 17728 bytes
SHA-256: ad44bfacd97fed1fe83a78968c0017ba65e2d908203d082cb550ce3632cb551d
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10764 bytes
SHA-256: b6483267ab7d353770506d8bfbaff1290e27b74e8cebee418d054a15ecdda222