Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68d9a3b65dc6ab5…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 06:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 014e9eaadf29b9a2bfe4bfbd5d97f8da SHA-1: b8df6243386a44cdecb6bc86ea5ff6555571f1c3 SHA-256: c68d9a3b65dc6ab51d70055c89dda7e3fdfffddb4abb4ee70e59fb3324961bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate that this file is likely part of a phishing campaign or a distribution mechanism for further malware. No scripts were extracted, but the overall structure and URL patterns are highly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=robusta+coffee+price
    • http://www.radio-kum.si/data/files/zezemazowagas.pdf
    • http://esoftland.com/userfiles/file/ruwul.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4183e18c2---24566934171.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821d832762a---58527344424.pdf
    • https://amitadevnani.com/userfiles/file/pedefafovisobe.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/80500036574.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cvm584tjljophkm9fsup59le95/89372276492.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/506392fccf9dbe4b876ef9ea294f97e7/73263336129.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7962a9cc---jotapelami.pdf
    • http://barcabianca.eu/upload/file/wapexa.pdf
    • http://kassa.pl/userfiles/file/31732407996.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1888a812d05dd8d8fdaea16f83525755/35290798388.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/18763297260.pdf
    • http://briarcliff68.com/clients/71184/File/2096439847.pdf
    • http://ndt-tl.ru/upload/file/94042652163.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b507cd67414---viliminazejurijipotoretox.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/09d9ced71cc072d5ed453bb5cd3cf537/zobomisakukige.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3a5e33363674e015b75181ccd1335d47/muwomowogojaxomopiluxuka.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf7d5f442---56011069793.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccafc4fa72---nifuzuji.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/be8d689cd2120ceb59be4a81af61d3e0/winigekored.pdf
    • http://agcslohian.com/userfiles/file/75582733730.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d5nkhjjblbqm5gtt921lo8hcek/28837983262.pdf
    • 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_off0000e956.bin
dbe55b3d05ff832dbf1ceeb715910b1330cb6e421fec20fee40e64eb2a5ad3ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 10608 bytes
font_01_sfnt_off0001018f.bin
608f0ab35d651195e2ded8104793ca9fc1b26066ac3baa92b1213a90d612b608
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 17468 bytes
font_02_sfnt_off00012ee8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 16792 bytes