Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba789e2a8dc12e2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 07:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7e934637d6847e84e10074a79044d07 SHA-1: 92b8dc4fac67cb311f89ee242254560e523a32f3 SHA-256: cba789e2a8dc12e2728556613cb764ce5933a97c4cf09866a8be57e270348c91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious or phishing content, a common tactic for distributing malware or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966e7f36841---85979451773.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee64363b2---nazomamizerotoxiwi.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/rizalofegudemunejona.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/25347576031.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/bunudufo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/81715828390.pdfIn PDF document text
    • http://rideco.hu/upload/file/merigedefepomonutejolof.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/molasajejimufifukenopur.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/olot4qp3kslite5i7i5fjnplq5/15094413415.pdfIn PDF document text
    • https://irantruck.ir/data/file/75503793084.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/47162b7fc6279d9702259945bbed0222/21966145769.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b70eab610---7470726047.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/87116508d6406d93cf77d321428cdb82/dunedewewo.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/jalipisaxido.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607062bb7d32e---gojijeko.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/sidexu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e15af2d68---pilopet.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/xonakuralimugek.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/62085675946.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829c800dc2f---5749293501.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/xavosubapekabojokugetivan.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609592aef393d---26663386968.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/vipopiluvekevane.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/81476975954.pdfIn PDF document text
    • http://chinahongji.com/d/files/lozewukajurede.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/57121917951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=geometry+worksheet+similar+polygonsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3814949adae51d21f18ccf110fd6629f/17325038708.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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 11028 bytes
SHA-256: 8cfce9079b23934562fe4abda478e2b1f6a712d0128ec1f013f9ec8c733b0102
font_02_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 17856 bytes
SHA-256: 6092be2e590c54cfe7069f92c8096b2d2b20a7b24fb5dbb6dda56f3467050205

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