Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3c5d9bf9d989d9…

MALICIOUS

PDF

83.7 KB Created: 2021-07-01 13:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b84f689966e0a56108b3bf4fe21fa9e SHA-1: b4dcb4f4f5c15a74c36cdcc8e08eb34a345d8257 SHA-256: 7d3c5d9bf9d989d997f432bd720136395400a2c2ed1d2b74342effb00bb91693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external websites hosted on compromised CMS upload storage, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign.

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://karapinarinsaat.net/userfiles/upload/file/92910525672.pdf
    • http://okmarin.ru/userfiles/file/kogurororuberobeketagoguw.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807c10f2f6---88521964874.pdf
    • http://atthaya.com/file_media/file_image/file/pitajamaloxijuj.pdf
    • http://davidlbrooks.com/clients/868292/File/ganakesewidexerazopunel.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/bofaboxovisujowodowoli.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761a176ec70---1202370130.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1abdec94---28873184863.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e8a18681e---31329700517.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u2ro9onjnahtfdj5bi6es1fp04/52355503484.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb9e6dd8e---matagugiv.pdf
    • https://www.alapan.org/fckimages/file/tudijodo.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c666d3577---rulonopafexud.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b2ea478---lutirevupufoxavatigo.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3b65986de0fed710943eb96445d2a98b/70487394355.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5c51f589---numizakizoxurenejofonosil.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7bgnkobgehsor5srfevhk29936/62236587343.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/vugukofamobiv.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/sebavodedotabiraji.pdf
    • https://signika.pl/Upload/file/87960901315.pdf
    • https://bloomland.com/sites/bloomland.com/files/zonedidugogaxodu.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cc21ee084efcd892acdc0659bbfa51a8/ginarot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=latin+words+starting+with+u
    • 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_off0000e711.bin
7481faef2c430c46a7c2e8cf31414580de0cab67cf3d626c3c523c6e9c80f341
pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 10492 bytes
font_01_sfnt_off0000feb5.bin
453aba03b9092861c90a53c24606a8142fbcd461b3a02ceeb1a89f61ea71ee3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 16540 bytes
font_02_sfnt_off0001297f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes