Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc6849e4f3c4d63…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 10:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58cd118a821010e56ec4c043f1ad0e27 SHA-1: 32a4083a3a97f012e10aee6f229d34ceed37dbd1 SHA-256: 3cc6849e4f3c4d63be8e30f7957f5c5877bf01b28f0c35f9a02ef6c6c0a5306e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of multiple external URIs and link farm indicators strongly supports its role as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dataction.org/demo/dataction/media/95104374370.pdf In PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lometaso.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/loliwuweruvudapanesas.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/20278412673.pdfIn PDF document text
    • http://lactopad.com/uploads/files/5013334098.pdfIn PDF document text
    • http://4bx.pl/public/file/40891079024.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/79234590782.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1747417456613fa3230dfe2.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904051217.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6oql7h23adgosop6j2170tol8c/11408829186.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/27s065b642cc8ekld2dhohjue3/lavoxidekefiwowazabimi.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zekuxulofugujipivep.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/23948091956.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/metijavutakesokinizenufa.pdfIn PDF document text
    • http://ausafe.net/images/art/files/54036054037.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa8f03be4---texorexeta.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/libuw.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/wejifikutamumutotitile.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c2403355d581e9a455c0cfcc598c4130/73080200976.pdfIn PDF document text
    • http://mylodge-naoshima.com/foxaludagobu.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/pumewedukalobifu.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/narefedibetawakikexuwaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mame+emulator+windows+7PDF 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_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 10636 bytes
SHA-256: c05028744db739ca2a7c2fe218ad73f0d1636ecdcc1aad7b51221b623436a1ba
font_02_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 17748 bytes
SHA-256: 271ed5ae205529aa8a44d94dbb368f1a24704844575b223aac3d9cacabd0ed22