Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc91530dc1082ee…

MALICIOUS

PDF

89.4 KB Created: 2021-08-03 09:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44bfdcd089593bfae141efb13bcaa6db SHA-1: 68a48cb9136b2de544075d5aa22f5f01683c8c15 SHA-256: 8dc91530dc1082ee9c8cda11c300984ebba00b2d286ad432fc7502ac8cd1e9c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to potentially compromised WordPress sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates these links are likely hosted on compromised upload storage, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • 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://ajansnigde.com/resimler/files/gibusa.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5s32a6r3ms70p464o3iradm8b4/54846525117.pdf
    • http://sl-light.ru/design/img/upload/file/81580697138.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0ccdd5bf78511d373ee4a3c53af9ad0f/werozaf.pdf
    • http://belgium-ex.com/images/blog//file/66991274083.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43039f5015ef90bd241bfc2c9fb97bd3/39295267484.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160888cac37d5a---rizurop.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3a098fe4ff229885635851182ece78f/96866450466.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba137f0d5e8---vetagadixamarizuzuziteraf.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce152fa30---13025479358.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia006ik958rjqbiujpqfrc7ev0/2468726191.pdf
    • http://cs-golfclub.com/ckupload/files/30038727953.pdf
    • http://akssert.com/userfiles/files/xexububixovizag.pdf
    • http://dragoniresorts.com/userfiles/gazusiketu.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cea20bb78---luranasupovage.pdf
    • http://zwickerfoto.hu/_user/file/15095837641.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5c9a93c03487f3b346eb333f865a42b2/sajudekubifozepu.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1c75a537---vatukalamogunejate.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/82607381103.pdf
    • https://equator-maritime.com/userfiles/file/vifupavowizoditalofigifid.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/01cc084475c709bd7562842eeb3b6b21/25366141542.pdf
    • http://uniroll.pl/user_images/file/tewulupatizuvisowelado.pdf
    • http://accessiblevehicleservices.com/userfiles/file/ziwitubap.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/83aeb16f30aff9bb48b29d3accf41023/94208437980.pdf
    • http://haphadoor.com/upload/files/80727643204.pdf
    • https://fallsplat.se/file/dixazoxuvinakavejibiki.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e3be3aa35c7f94f29cf56da09e910114/28627833429.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098a792d4b52---42137028761.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=present+perfect+grammar+exercises+multiple+choice
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e036.bin
a493cf14d42598d256b41302b6b737aafa7e6b0f151a2977567a5726682abbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16112 bytes
font_01_sfnt_off0000f58b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
font_02_sfnt_off00010da2.bin
652adf08be66162352b42efd8133ba075decbd3e20e76fff2cda778f07199f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 11132 bytes
font_03_sfnt_off00012778.bin
c3388c1a2ef2949cc8e40e305a5c00622066f3be781c6e141482ad16d24b382e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 17856 bytes

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