Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1103c4f759ca07…

MALICIOUS

PDF

76.8 KB Created: 2021-06-26 05:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26ee0c51ab4f64d1a8b0620c1cedf93b SHA-1: ed6be73bd4d8dc6c842d62840df29de21be6a532 SHA-256: ac1103c4f759ca07942412ad6f6e3557c0f4bbeeafd580ae2f00ea43a03280dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of creating link farms on potentially disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf4e47c96---12384193677.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9b1609f9---nerojuzivezasadisuviloju.pdf
    • https://tavio.ru/files/file/tugunazowidofipas.pdf
    • https://uppersanduskyrotary.com/cms/files/File/nolinegabij.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/142320db5d786cb2b47606a6d96c0436/tovojuzidinege.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c079c8ec23e---58089564535.pdf
    • https://harkakotony.hu/UserFiles/file/mitovegopakoz.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/11798434054.pdf
    • http://gd-weimi.com/upfolder/e/files/20210531164242.pdf
    • http://bbfrontedelmare.com/userfiles/files/68759506332.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6a632038dc12ff2b2cd5821b3bfc0490/jipewelu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba5f73c55---derajojupigoveri.pdf
    • http://atomleasing.ru/media/File/fosomuxolowunarijo.pdf
    • http://hzqzg.com/d/files/fojumoropete.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9006ffc2---37368179381.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bolmqbs6o4mgfj22f2oblv30e4/48276950803.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fd0ea90abc06c1074907e9956adc7b91/66687456241.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9f487be4---77303762711.pdf
    • https://rugsinc.in/UserFiles/files/82771186224.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/71ec0t6hue96nfqrm50b4cf7us/70129526349.pdf
    • http://c-amc.com/upload/files/14420805736.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d743bd92fd37215ea1bfd593985641c8/nodudezazelowulene.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sign+in+sheet+word+document
    • 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_off0000cbfa.bin
7b8aa343c0deae0a63d6c058038c91538ec3c4677c6a810eb7ca66a4e85583da
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 10868 bytes
font_01_sfnt_off0000e4c0.bin
495aecd1b10136c6a3662dfddb396935e528e0c4266c7759e27dfae309001539
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 15988 bytes
font_02_sfnt_off00010df7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes