Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d1b2184b0044f9…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 11:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f8a8df98c1c373b4aef60e26e643a3d SHA-1: 04225f5eb4933ef18d3c9b18fa7288b14c6861cb SHA-256: 66d1b2184b0044f9d75388cb688b1b19f50659c9b39897df6081a4727894b83e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609251c9e3d57---xelatepimaxeg.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9308aafd8894361a720783753a845569/wipejogakolox.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/83625862759.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608112b788184---25670514935.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f7ce55c2ccb391e5ff5b809c5d2950fa/3414923950.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046f22c7c6---44939210743.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/76c524cfbfa857b826826fe948ae5e85/mumipajedojutuguwoxoro.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/921de671f1801446bbfd5a8266ee56e2/83167333110.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/7465808939.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7921a751d308011e42b66181d2caaff9/23444634470.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544368ed2b---51534582732.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cce34f59c4b736e3dd12e4085b749a1c/57640722987.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/97708251774.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0858eed1e---donuparewi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t1ie0gp10gnb09r2cfqu98l3o3/74393607997.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7562707d76---pupaj.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/8807391802.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/50487419912.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2cc54dda---jiwogemetizaxizamevelalul.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/safovewudaxarogexaxewu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/danaxamegekuwuvolasomise.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-07/images/files/88278259140.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/86838197110.pdfIn PDF document text
    • https://tonitomov.com/picture/file/50679050318.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b80252c873e---70348576967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=in+the+given+figure+abcd+is+a+rectangle+and+pqrs+is+a+square+find+the+area+of+shaded+regionPDF link annotation
    • 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_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 17580 bytes
SHA-256: 62398790429c54382e0b5cb4b82d75d054f7d24c77a8275b3ff05896f73938be
font_02_sfnt_off00014e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0D 11304 bytes
SHA-256: 967dd1d9970c21c8ca1c46aadbc68e4c39830c2f23a01cdd37287ea5246ec93e