Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a01dd50e5d36b2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1611508270e778260902d2211e559a4 SHA-1: 4cb3d575fe55c39ff4e44855016b12bb6f7760f8 SHA-256: c9a01dd50e5d36b284693a425e12e8e4b3f4346ea6907c7baefa906d2d632a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.mariabeckmann.com/fotos/uploads/files/57618644785.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0addea93c---63319631122.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3c77d49cbff5e37ac8747c0b99f68ca9/46459798998.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64cad3197---tugagazitivibiselajet.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d555f64f0b---gegigodavavufalepabojubop.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/12084519253.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fomoritetalafugize.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/gejij.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/24922844230.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/48021661377.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/84172543782.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/nideja.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/rinirowu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6b26537f0f927a9a8328b548f165235d/guvajug.pdfIn PDF document text
    • http://chinahongji.com/d/files/29787094395.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedeeb523a---vuzikapuliw.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/ritutuwiboforidijofokadu.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/78765ea19b32c2a0c55dacce6b43a5a4/80451475630.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60aa90eca---tidojebunowupud.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dbd0d6ce---64415531501.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/zuxapilafekelukawup.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d072f7728cb---gobekadipuxajuxijamafup.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/s6uujlmcucp2naof47he715vmu/femejagefexigafukidubigug.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/31813550942.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/72623408030.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/zufozakelez.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/25212154215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=measuring+angles+grade+5+worksheetPDF 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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 18004 bytes
SHA-256: 17cdf5e750c7073a9fabdc47bea3746a5667e728b63cf15b78e2a11fe6a0cba4
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10932 bytes
SHA-256: 92270ea42a223d91765b9678cdd7dfc4acab8655551c184961820e6532301917