Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc56967a541f2ae…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 12:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fae1acf6c370fd1545dadaf5d78dda88 SHA-1: e4afb7ce68fda7f6674379aaea2e4b664922ed0b SHA-256: 7fc56967a541f2aeb77404091679c0b053602f41cb2ee65d782783cde7cb231b
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiolegalezullo.eu/userfiles/files/5519023269.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/meduwozojigimov.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vogovog.pdf
    • http://retrolondontees.com/userfiles/file/remutulimivumapiwivop.pdf
    • http://rrbrentacars.com/files/others/kisetow.pdf
    • http://plafondchauffant.fr/img/user/file/48266363273.pdf
    • http://dok-vo.ru/userfiles/file/mojuzunupi.pdf
    • https://studiovizia.com/webroot/img/content/files/84440571832.pdf
    • https://villadorottya.hu/uploads/frontend/files/83870130811.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb10526374---zapaxosapenefuvaximidije.pdf
    • http://camel-republic.com/media/userfiles/files/49497344079.pdf
    • https://eslms.com/userfiles/file/48903571314.pdf
    • http://infosierra.es/images/editor/vukuwitirexime.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a714cba---wilisibexodejowovugijirit.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/3929568010.pdf
    • http://epmresearch.org/userfiles/files/babako.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/luvebixesivaxufidokor.pdf
    • http://ibnuaffan.com/ckfinder/userfiles/files/94947344497.pdf
    • http://epmachine.ru/d/files/mejaz.pdf
    • http://slsnn.ru/content/file/64431416222.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tivoda.pdf
    • http://leaguengn.com/userfiles/file///48575408899.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe876a6263---kosafada.pdf
    • http://rem-stroymont.ru/img/file/liluwanefufafepokolu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gangstar+vegas+laptop+download
    • 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_off0000e88a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
font_01_sfnt_off0001009c.bin
12d4ef0d441cf77ee80e6307bb85eb4b5bb44987e0fe0a0aa58645b91a070dde
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 17328 bytes
font_02_sfnt_off00012dd4.bin
4a38d1676712b177d5a383754afec93244c11db0f20ff650dd78ab9ef4370dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 10668 bytes