Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c6c24374950a87…

MALICIOUS

PDF

98.7 KB Created: 2021-08-04 08:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6187dbc6b37f821031e9c11195f39526 SHA-1: ddaf9f8dd384bb180c33d7d4be5ba7c1b4adb2df SHA-256: 83c6c24374950a87b494b74369c729f58d21626ef3e36a64dfbfcf61c43b871c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into downloading further malicious content or phishing for credentials. The presence of embedded JavaScript, though not fully detailed, suggests potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://synerhu.ru/uplcv?utm_term=jurassic+park+3+full+movie+in+telugu+free+download+movierulz PDF link annotation
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/713689f5a751ea3d84442213bb87211f/polajixovelodoxoze.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/96d13de30bb5544a5682002e53b795bc/bobizujajufasexu.pdfIn PDF document text
    • http://splogservice.ru/content/file/83162837216.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/83714819468.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/72028613685.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d363da10d7---wilodejogesoneva.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/42079441587.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9o074jeg6qsoadlnht2o00hlfu/luwomilu.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/84787987769.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8cecou2qtqlnelp3t015gpv2p5/gimafutisas.pdfIn PDF document text
    • https://andana.us/files/files/vunejewizubawin.pdfIn PDF document text
    • http://mebco.ru/images/file/36295549219.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sepewewejonuw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d78c1914f0b---70015942317.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/544bf4020ef2028f3ea6ef6bde59eeed/zazudujodetepevetetuxen.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/55919372680.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741fee73dd8---20423470268.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e187e04f---dasepolovi.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/40094616866.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/marig.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/tikijekemubara.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8954171cbaab2d589a386a7aad6fc65d/jofidumubatazubewuru.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/foragupajop.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fd5a21d92---nuxosobeguporozuduwub.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/31801887623.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/48605274211.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 11532 bytes
SHA-256: a957c51d5fa65482e6c5ac6553e35491e97873b949e9a7f1112bdb40a30d41b7
font_02_sfnt_off00014cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD5 17912 bytes
SHA-256: f99dcb2bb1815f6074c690e312e605a87803742d31b19261eea35355c3de7a34