Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02600fca774a780…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9271c1cb50941d2ef57c60701ffc97d5 SHA-1: 1d18d2f794c6b8358d25a98a20a6c3b7cb8a5921 SHA-256: b02600fca774a780712e6df7e600146d585f404b019b893c15c2ce837e3ab17a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=game+of+thrones+game+android PDF link annotation
    • http://3colorjazz.com/fckeditor/userfiles/image/9526600888.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/risarad.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/75125020049.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/kinamesane.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/2824638913.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hb7prsoot6snbci1drbdvuijha/30854348975.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091318545826.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161325f52bb145---49542899394.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/39229079910.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/79110840518.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/66431992728.pdfIn PDF document text
    • http://ruresept.ru/files/file/48887404306.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/zugipagefiroma.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/futejorereluj.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130371f8b06c---53950506235.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4d650677---julusujolalat.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gifalodumural.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/17899837125.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/satumadinanaraxum.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5b0f2aldld6173v7gtm5db7jh8/83998914842.pdfIn PDF document text
    • http://cga82.com/admin/File/49344541978.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/vumadanobizeko.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/13289943998.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/ximubufakanudemox.pdfIn PDF document text
    • 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_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 17564 bytes
SHA-256: 378ffc62aa797db77a3c91ffe9f92a0cb5b10ce58f5e2dc13ab671e2f49697bd
font_01_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 10796 bytes
SHA-256: 6faab5f987d67f92ca0484c968bb8c7890985d59cd0383448e7014427db2214d
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1