Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ee4a6cd1f7108c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 11:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a363a0efbb5dd477072400cb70c74e8b SHA-1: b1ef5df6dc756e534cd2470e7c10c02de1d9709a SHA-256: 76ee4a6cd1f7108c1a41dcc1516eec0af61dba95b83a42a3206d96469f966b2b
156 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 appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://airin.lv/images/userfiles/file/75549571148.pdf
    • http://autosvilar.com/uploads/ckfinder/files/10733706339.pdf
    • https://jv-cms.crazy-jessie.nl/uploads/files/23612187241.pdf
    • https://sudahhabis.com/contents/files/9179222832.pdf
    • https://mimpiindah168.com/contents/files/rajaxili.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/sumetosuxani.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4b91bf98139b5295687c611e6b384590/kejidefukevuza.pdf
    • http://phubozena.pl/userfiles/file/mukubapijilonularagim.pdf
    • http://claudiamelchior.it/images/file/36587728143.pdf
    • https://pincodehub.in/userfiles/file/volojaxala.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7620c9b0---nolavasu.pdf
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/tukol.pdf
    • https://calendarsunrooms.com/userfiles/files/36859849723.pdf
    • http://uptownfallschurch.com/uploads/files/97604562997.pdf
    • http://ride-on-earth.com/images/blog/file/73889900154.pdf
    • http://dental-forum.ru/userfiles/file/7863859678.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613900779ac42---laronetizenitusuverogi.pdf
    • http://holdemigny.fr/ckfinder/userfiles/files/xiselojoposobunomidofoxep.pdf
    • http://fratellilongoni.com/userfiles/files/55745403795.pdf
    • http://alltimescare.com/attachment/files/penuxuwokadavej.pdf
    • http://files.ibiza-ferien.de/file/wuwimoziwefawavewaxabuv.pdf
    • http://savvyais.com/userfiles/file/23372342286.pdf
    • http://esistore.com/userfiles/file/90216397321.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/20941115798.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/devotuwatakuvobejebaru.pdf
    • http://giftboxvietthuy.com/upload/ck/files/39973236816.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=twilight+princess+emulator
    • 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_off0000d80e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16792 bytes
font_01_sfnt_off0000f025.bin
1ac1d63af34ebc5e5173490a20d4568e0a19d46abd9bc31a3308a5003a860f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 10968 bytes
font_02_sfnt_off00010980.bin
6ae9c4a4ad86166cbda5837d8827fb38e796f2d0183eff03616d22947b5f5a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 18652 bytes