Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ae35cf2d31e1e…

MALICIOUS

PDF

89.5 KB Created: 2021-08-12 13:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87a93b83bf4cdf1c9ef1f9877207e193 SHA-1: bedb2d9b7ce1f08e7615ba491df2842cf86af8eb SHA-256: 852ae35cf2d31e1e883f2ddb0d2f0fec5d21ea2a494b94e9ce28116b631d9a15
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://jnnycc.org/userfiles/file/60108905261.pdf
    • http://netflor.pl/upload/File/luwipevafewex.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/bejevonavovade.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/65064997051.pdf
    • https://flomogroup.com/upload/files/45576326791.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba9603c7---duzagezobezovivegarev.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/64171097590.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a562ee1233---20999991496.pdf
    • http://unewstoday.com/task/userimages/file/jupuvimijivufokuxane.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/dq5mia7m0d2pmh5thg15h6f0ln/96041111392.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/35163105693.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd5a429de---tifiz.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7a030a9d206804152014ad98406be862/39418827688.pdf
    • http://a-kamen.com/userfiles/file/redowugowudigazav.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/15133478311.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/70a9634c84c8688cfde12c094f769e85/40312466477.pdf
    • http://aucoindeshalles.fr/menu/file/10498366679.pdf
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/044233ac3231b10f90ce46948a20b115/bajaviw.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/jafedi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/43d9a07628af816c88e695ad0c88db46/zunademi.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/31041363d8867feae48b7afd2b9496a8/99684291238.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a6901d894ea192d581efaebb69d96a9b/tunovikugokuwurezilul.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0784bfc4366dd96c63876dadc9b0aa5e/99828265035.pdf
    • http://cpk.by/ckfinder/userfiles/files/86880455642.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2019+tamil+movies+video+songs+download+hd
    • 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_off0000f714.bin
ca862982fb00ef8a7af88199589ee55aebba3e69023f2a202dd2b44050ed0101
pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 11112 bytes
font_01_sfnt_off000110b9.bin
b41091f3345b09135385f2f093336cc9b535273d07cdee9fbfac5e3a9e7db51e
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 17476 bytes
font_02_sfnt_off00013eb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB0 16792 bytes