Malicious PDF — malware analysis report

Static analysis result for SHA-256 636e016faf6b24b4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 03:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b70a743cdaaf693b4f0308cf5cc5aed1 SHA-1: cd5083e71caebcf8d943dafc1630281286384c31 SHA-256: 636e016faf6b24b43f7a9a0a64f07f1d5d8c40c9f9977a317b62ff50e39edc20
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=focusrite+2i4+manual PDF link annotation
    • http://altelaw.com/uploads/image/file/22716304115.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/36155925988.pdfIn PDF document text
    • https://cncunse.com/d/files/xogofa.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/toweke.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119a6543c64d---refanudejexifevarax.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/46151329643.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3fef2e48c4508aede47601e70c239f07/rogeteteje.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/xazagesegofewaxivamez.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/mojubexiboziso.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c00728d---kolowivijidijewirav.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/59606014725.pdfIn PDF document text
    • http://altus.pl/userfiles/file/waderilanaj.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/juu6mlk0qgv0jb6hdmva286p20/20238352734.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/156looh72lcnfo4e510rkn8ol8/kafin.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/41758106934.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f582000e5eb---ludukevaf.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/ropizupafal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8sd9dbri35jvb0l4rtb39dqeb4/2906403353.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/99d6b35ec2fe470a3294a920c77f2454/xijopoxonodemomidigati.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1351a442e1---93808189728.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/32222535269.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210822082101.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/39029394757.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/67817964788.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_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 10664 bytes
SHA-256: cd217a9b947a6518bebb0b436a095fb2733d361184eaeff7b35ef4b273c32e63
font_01_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 17692 bytes
SHA-256: 3c79ab01c83cfd5b5a93a643f4c5530e50b57c2f619d6562971513f8970c4b68

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