Malicious PDF — malware analysis report

Static analysis result for SHA-256 923ac96abf78f7c2…

MALICIOUS

PDF

88.4 KB Created: 2021-07-25 17:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12d917363df11a537834d6f20d6feeb8 SHA-1: ce45bc1280f3df2075e08cafb89d078735bd39bc SHA-256: 923ac96abf78f7c246228cbe97fd4eca61f8fb44ed94f6a6df01af20f5576d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oglethorpeclub.org/~oglethor/UserFiles/file/jalebanasopejewujezoki.pdf
    • http://haniltm.kr/upfiles/editor/files/23204175579.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32bc2af21---gebozexosimofe.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091451374c6d---64166489328.pdf
    • http://ramenzoni.eu/userfiles/files/xamutazimaralaleranokep.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7519467dfb---rikiwudebedozazidi.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/33548483594.pdf
    • https://landbondcorten.com/attachment/file/81d430c8997ffee20592ab4fbdaeddf4.pdf
    • http://hillandbrownfamily.com/clients/76964/File/kizibelogaxabebug.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8b30f4c9d87bc0e68918b991c7a652b6/tebopalimadepofotupuzo.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0811bac49---zikosepusuwitekosubuf.pdf
    • https://hogies.com/includes/template/uploads/file/gurilevexoriweboxi.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0d22119f---38700179289.pdf
    • http://malagi.pl/user-files/fck/file/57827117019.pdf
    • http://yesilderecine.com/admin/editor_resim/file/xatona.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36596044e---3962950154.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a9ba0c0856c50d77cfc836934a9c89c4/poxavejezi.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/99232185999.pdf
    • https://bedandbreakfastchia.it/userfiles/file/84682773180.pdf
    • https://amitadevnani.com/userfiles/file/85070770506.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f9acd01a---33798799075.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/rugivubapezemil.pdf
    • http://inventory-acepipe.com/images/uploads/files/79448386121.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49816a52d---4407146865.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=exam+cram+nclex+rn+practice+questions
    • 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_off0000f3e1.bin
e49e409edec24ea99e5c98f54ca98a6f1ab0cc7f3e86d129adf470349b9cc1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 18112 bytes
font_01_sfnt_off000122ce.bin
ea4322ca65e28d4e05d16324d761503e2128516ae979df6a708090c1c7c36c85
pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 10868 bytes
font_02_sfnt_off00013be5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 16792 bytes