Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a35fd207e399bb8…

MALICIOUS

PDF

85.5 KB Created: 2021-08-19 14:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c9ae0d10b7b5736e6ed6b94b1548579 SHA-1: 00d6d0c9a97200949c32bac000bceb907b9747e9 SHA-256: 0a35fd207e399bb85c571466bbfd7037e62a982dcb31eeec8a885e74f2a68a59
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure and URL distribution align with a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nineslash.com/user_file/file/9199578101.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/67vjfqb1r3n7l1pf39kftu9er1/bakeminobuxarekotokebuxo.pdf
    • https://sardavetri.it/userfiles/file/88301979745.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f591e04b---2601466297.pdf
    • http://siltherm.com/ckfinder/userfiles/files/1128948902.pdf
    • https://duproject.com/uploadEditor/files/nisavariforinoponid.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1251c7f5---28765792460.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ca217aac851b7c10ee16f4a1f729ea6d/vurexidixosojimokuto.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/vojoxigotovululidu.pdf
    • http://dorapeyzaj.com/userfiles/file/bolewexon.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/3031438701.pdf
    • http://5m-tti.com/uploads/image/files/xovutusik.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a1608e0606db3cd8842cd43302d09453/pipit.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf841a467---56054257679.pdf
    • https://colakcivi.com/userfiles/file/8450218890.pdf
    • https://pnp-studio.com/fckeditorfiles/file/pakugadopefut.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0281dfea2---resowikizututufozufi.pdf
    • https://j26clean.com/upload/files/wimeretajeminajuwe.pdf
    • http://traktorpulling.de/ablage/userfiles/files/37693654810.pdf
    • http://drironcat.com/images/file/11951633345.pdf
    • http://belhavenhighschoolalumni.com/clients/13962/File/zomomovejise.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/woxufamisokewumugorida.pdf
    • http://yanartekstil.com/firma/files/vujulefifemere.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nombre+de+titanes+griegos
    • 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_off0000e614.bin
b3961a6a8fcccbdf5d201187e0d8ebd4cfcbc9e1acd98a97d6cbd44b7ba84474
pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10660 bytes
font_01_sfnt_off0000fe42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16792 bytes
font_02_sfnt_off00011654.bin
e918f6f33a02b009d0e271d0bedbc39e5d5e0479b7772aabf564e5dedd23c9f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 19372 bytes