Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c0eeff6a29aed…

MALICIOUS

PDF

106.9 KB Created: 2021-06-29 02:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9855620b912b724c8dad4579d593e3dd SHA-1: 97f77841776cbe505ce5d94f055ee73fcdd8a9f3 SHA-256: d36c0eeff6a29aed1dc060f423be44d714c38af661a74a692aaecf0109aae97b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://cructi.ru/uplcv?utm_term=chronological+order+of+the+minor+prophets
    • http://uro-medical.pl/zdjecia/fotki/file/38626742548.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609084b793f16---33243291906.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5350452d278878caf399417ae5ba1629/60840504839.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797947eb19f---46714082073.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/25fe55bd57e2fb8375b0c5b4a2a91c8d/fijowaleg.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d6cd52c77a1b28220038cf8510e0fa6b/nofenegoxutixi.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e924dbba---82963822125.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b168c457730---wiwolesajeji.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72e2de66e---41674103532.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7ojovam0lbe480d63nspam7vlb/widiziwurugadi.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609272689bbc7---7498315765.pdf
    • http://www.moyekolodin.com/files/99015030033.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6985a56a---gatusejonigazexotojatut.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f1484f70---80943884189.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b5bo28jp1lrshm587fohi7em60/nikexuwitodij.pdf
    • http://a-kamen.com/userfiles/file/xupurejigapusogoxedegab.pdf
    • https://diphong.com/uploads/98129179477.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd72d9e1f4---pizonilubovepe.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ea88a454---vefitajijezu.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34597e84a---54745055740.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/04ced080e58efbd5a5dfb980f110469b/8376148787.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e613df7c---jirunevegalozosul.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9c61f6b7---jupelob.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba335605f---76031856459.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001402c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402C 16792 bytes
font_01_sfnt_off0001583e.bin
7d375e491406fbf2422c018af798fc389db47becc75f860c14b16a59589a2bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1583E 16416 bytes
font_02_sfnt_off000182d5.bin
e3e76bbda778bd95208ca8b49f6c30b9022cbf22118373daa6e90a7fc436d7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x182D5 11096 bytes