Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba4f912518f67c2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 07:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 560facfa55d2f9fcc8f1327cdc6ae434 SHA-1: 405b5afbb2b9e7addedf0efcfaed90d303696551 SHA-256: 5ba4f912518f67c2d96128c7ebfb122a56f08c74a0d0c7954901979b1bd0a0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the link farm structure is a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://iphonedown.com/ckfinder/userfiles/files/jirurenaxirubo.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9872862f---xanapasinorelabe.pdfIn PDF document text
    • http://mariancozma.com/_user/file/57086446555.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/8427151860.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16121c8e023684---povotibizo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076505166c45---81147601310.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kewuxixeri.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/nodovuwejuwejugu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mn8eg76n3vd8u1eg43je6o6kt0/16560121299.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/673daip5m67uvhemp3tgbjqbi5/nelogofide.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/lijakiratidilukize.pdfIn PDF document text
    • https://ms02bet.com/contents//files/vifoxadakozusuzuvolel.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/34e21514daf178fea24a1a14c270692f/52575967209.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/vemupajosizatat.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/91146677749.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/32284499901.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/6864518290.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502005421774663324.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/30162326866.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/64610846027.pdfIn PDF document text
    • http://budka39.ru/files/zitorovam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dka91bhf19tr6lum7n45igp606/38669682477.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/81326915430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=entire+shrek+script+pdfPDF 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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 17280 bytes
SHA-256: a53bfc6e95d5e17bc33c8664c37e2d5ffcdfe47da09fbc5e90f7fedd128449b6
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 10464 bytes
SHA-256: 2b47d0a4ced72baaa218beb2d04930c60eff0b75b489b909d4b3a76686c3874d
font_02_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1