Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce2728f7a055393…

MALICIOUS

PDF

99.8 KB Created: 2021-06-26 09:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be1815f987d8772d5840e3b8706c0548 SHA-1: a6281377d51d968da3cd4497bafc532e97fcc256 SHA-256: 3ce2728f7a0553930c37b55beba8f17deaf8bbe7aeac4c3f1e151e8680f2a867
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external websites, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to malicious external content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://animalscipublisher.com/files/upfiles/file/diremejubixa.pdf In PDF document text
    • http://garmagostaran.com/Upload/file/68549212029.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/17842947138.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/pokusepimakupevudoz.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c7389093a4cc6fb7a47186cd6d6c47aa/nunefuviza.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5edd7de24041e3e4810d16bef7076495/godupivarerikebedefumofow.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/linezanamevekuk.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/67855266111.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1g9557pjdilf5uma1ono1ccf9s/bagowenolugejokosikefewi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/693ca408cc1d85fb35c6d44a6aead291/xizunef.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/nosituxisitubirewafozupe.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/27035367513.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608681aa972c1---duzeto.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ccf7a0e7---fimumesez.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/lizofifewebuxo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f8222e5a---95535359665.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/lewemasotagera.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/40c979f919d07079f33dbe0671b79a82/zirowemarik.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48dd7a3ad---pukivaginoxurib.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b52854906---38944522700.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609add33bf0dd---seferufoxaligefidap.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e82ca9edcd3a8f3098fd4b328f5eb228/bawaruni.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p95b0nhcu6i98orr82mfsvm4i1/gogefujeb.pdfIn PDF document text
    • http://ahchala.com/img/file/39791829265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=investment+pitch+deck+examplesPDF 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_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 10772 bytes
SHA-256: 5680e1bdd40be8b9ca8a1bc7fdb7a757c97ea57c6244e1fc8498adf5bd173a32
font_01_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 17976 bytes
SHA-256: 2a3bc5b675a00a8e0ba72b49e683843cb770fd3b11aa6dfddc99cfb67ebda87b
font_02_sfnt_off000169e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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