Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef8602595034da3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 03:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6888c532ce208cc629dd519f2f3196bf SHA-1: 38ccec24d3cf26e70e50367b044584b2d95bfe21 SHA-256: 2ef8602595034da3304bd54ee8f01d3889d6fb33896509061c012e0994c46f2c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent, likely for phishing or malware delivery. The embedded URLs and link farm structure are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=the+escapist+apk+paid
    • https://traffictkt.com/viking1/uploads/files/44563061341.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/184fa5ugcn57ic54je066q40t3/xinitiwilasav.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613964e7b3a8b---fudanerowene.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84035170200.pdf
    • https://semangkamerah.com/contents/files/joxikuduluruvadufu.pdf
    • https://concurs-euclid.ro/upload/fck/famimowetixezis.pdf
    • http://be-now.pl/userfiles/file/voxijagedopijewo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/17f40121c1fd5ae6cc62b8b0eaa98d5d/51110008147.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/72615899977.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/ramipaxukogobiniropunuwo.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a64de5f9---nofamikikugu.pdf
    • http://artkulinaria.pl/sites/default/files/file/91342928101.pdf
    • http://ytbozhuo.com/upload/file/070321284996.pdf
    • http://j1ent.com/userfiles/file/20210901103513.pdf
    • http://hzjksj.com/images/upload/File/sodugoxevugujezajov.pdf
    • http://jfac.kr/ckfinder/userfiles/files/65101384367.pdf
    • http://diysmart.net/userfiles/file/pumexagitisawigumasaw.pdf
    • http://donauwell.at/userfiles/file/zerabuteka.pdf
    • http://zdravi-kromeriz.cz/files/file/92945077386.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/60799572601.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e398f7c60b0d200630598a9eacc88b0a/36789605011.pdf
    • http://www.findvoters.com/userfiles/file/vufoloduxogo.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/fotirixim.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172719ef4b---gadanerofirasojebuxarog.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/46838303454.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_off0000ca81.bin
54dab2db24294b5a3be67a514b21817ee5f0a5aeb540ccd7deb434b4ad507a01
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 10296 bytes
font_01_sfnt_off0000e1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 16792 bytes
font_02_sfnt_off0000f9f5.bin
2cbb93406f78b5f2e31dfe783b5873fd745d5a83c2a4c35dfc991c8d5949eaf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 20380 bytes