Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb40ac0c00129548…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 00:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5590d164ba8c18f63f18298b4f0e69ca SHA-1: 76752c861219eed1f3c14712d2d740bc0334635a SHA-256: cb40ac0c00129548933e2d444a024f9467c289dabcaba54d1233af35849139a8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to lure victims through various deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vt4nr777dma7cc29r7gm67l466/fepisa.pdf
    • http://aqbnb.com/uploadfile/file/fivizidolixakupovolenira.pdf
    • http://dissanna.com/temp/fckeditor/file/buvamemoke.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7ac7098d2c862f9e84fc76dcf569611/37859185091.pdf
    • http://speckrepeg.by/UserFiles/files/banunukojumop.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609120062fa70---nagiwesijazewuwixomeletet.pdf
    • http://timnhanhonline.com/upload/files/vizanotuvuguduvimujitera.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094241c0ed01---19175703268.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad6d2db62---57599764011.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7562b8947---jepaluridomagi.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e355b52a---68899506666.pdf
    • http://nicosiacaffe.it/file/fuwupax.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d64a52e0d---vizebisodafuv.pdf
    • https://peterdegendt.be/file/dofulunujewutekitiji.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/dfe50c094af6bd38117e249684168952/nofumejeduxuzodewuka.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/sinc4s3486rug3cip20hl89685/bosoxopisa.pdf
    • http://msslink.ru/userfiles/files/mewaxakapotaxenerag.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1586e219d36ec1cae876f11faaad8014/gediradudunetirede.pdf
    • https://bselink.com/userfiles/file/21413326426.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0d9d23cf401f8de72f69a0703559b326/90452685426.pdf
    • https://thuaphatlaihanoi.net/uploads/files/8653544918.pdf
    • http://musikpark-live.de/userfiles/file/sanakinurujidoremonilo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pay+it+forward+furniture
    • 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_off0000eaaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 16792 bytes
font_01_sfnt_off000102c6.bin
e6729ee55fe79016742411cea0aacd364334ad49d192a860abe2a06349beb0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 10432 bytes
font_02_sfnt_off00011aa5.bin
f701cf584ecfeb6b1860343aed95536e8239630c3962df89e83c111df2d297b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 17732 bytes