Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e64e823e23b3926…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 18:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb3e2fe8a8366b4cd9bbb1688ebcf3a5 SHA-1: 57358dea5bfb4724e4654f9ed1ad92e13a513f01 SHA-256: 0e64e823e23b3926b67112e9c9b347767cf5ea080969d3b9a6d2ea4c77f89e48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports its role as a malicious document, potentially used in a spearphishing campaign (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jooli.ru/ckfinder/userfiles/files/lemisenip.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/87153594511.pdf
    • http://artio.pl/files/files/naroz.pdf
    • http://pwmtqatar.net/userfiles/file/91945643093.pdf
    • http://eternoohydro.com/d/files/72059658555.pdf
    • http://maynenkhiinverter.com/media/ftp/file/vovativebidoridunufovoje.pdf
    • https://editionsitaliques.com/userfiles/file/81079462468.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/81088430281.pdf
    • https://xtremefitksa.com/ckfinder/userfiles/files/13311670568.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/vadajexesanozep.pdf
    • https://krafteco.ru/uploads/files/foropirikamaloniripu.pdf
    • https://nhuadailoan.vn/upload/userfiles/files/wewefegogokogudelakiwoves.pdf
    • http://industrialdevices.in/uploads/xibekevimiwadot.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/badaxupufixusefadebavef.pdf
    • http://euhoca.com/js/ckfinder/userfiles/files/xifamizira.pdf
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/26087387226.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16153111c2c555---84163581622.pdf
    • http://3e3i.com/UserFiles/file///18932447243.pdf
    • https://curewelldiabetes.com/userfiles/file/88242990492.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc063bab49---gugelozizoxo.pdf
    • https://vleek.com/uploads/files/ponumaxolawedewatez.pdf
    • http://finchamauto.com/pics/38696262934.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f72394f588---depomukosuramafuwax.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/6233308826.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hey+google+pick+a+number+one+through+a+hundred
    • 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_off0000b266.bin
3b9e9388dfc57e63a60b2fcac8511baf18993b569ec79c6e195db161019577c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 15144 bytes
font_01_sfnt_off0000d87b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
font_02_sfnt_off0000f092.bin
a82f184908942d9de8cde2753313112a7ffd5d0c41f22bd52f9e2de2ce91b746
pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 11228 bytes