Malicious PDF — malware analysis report

Static analysis result for SHA-256 7500ecb23aaa154c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-02 11:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1022da67c5507fedb8130d6440c53a1a SHA-1: 0f9d4ad30846abea9e2ce7e8dfb62e5a21a1b2f7 SHA-256: 7500ecb23aaa154c3744520670fc58db64c18929fe51947e052b5477ba15801b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the hosting point towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=what+is+a+cadastral+surveying
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aada9c40dd9---44192674185.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe70c66aa0---gikodom.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/43137473508.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/gitezuxokexoroxegu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd744308c---26058238054.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0c96dceeb265ed105feb00ea04a5083f/84786038791.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c600383f19618fbad36ac2e41987489b/76703471408.pdf
    • http://wooshin.kr/uploaded/file/172559986861029ba8d5b1c.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd433041a---sibewanijetekovetatirazit.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c61d742b7b1069da5ace60c8b5a6714d/pesezaribu.pdf
    • http://provia-events.de/pics/fotos/1/file/70293102109.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aae7cf9da---napone.pdf
    • http://gayaarchi.com/userfiles/file/20210621044453.pdf
    • http://lawngo.net/fckfiles/30063532647.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a0bcc03fe212088a067cc30e4d6f2786/xiromixatuwuga.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c68fad6c7---90883944101.pdf
    • http://files.ibiza-ferien.de/file/9234761370.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/so95db1e8f7pltkppjf226td5t/renididuzewewalafefukevil.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bd240075---renasufivol.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075220ae7e9d---26364147891.pdf
    • http://aihyang.com/userfiles/file/46261611646.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fdaa7dd976d1db1728c9130adbbf7133/texifisenirexut.pdf
    • https://okvino.it/file/44975112721.pdf
    • http://agendatourvietnam.com/hinhanh/file/sapofetesogeka.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de14efd906d---sajofa.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_off00010128.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 16792 bytes
font_01_sfnt_off0001193a.bin
a25084277acf59468967521a6df184c15ddc656512d4f4a1a6bc43098c27c0ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 16984 bytes
font_02_sfnt_off0001457b.bin
ae1c88ee260a6543f7a15ae01d1b45871410dfcfd35f28876eb16f6c1d8468e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1457B 10804 bytes