Malicious PDF — malware analysis report

Static analysis result for SHA-256 9194dc8276727860…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 17:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 156b473178a7e9920c1ddd79d3812fe6 SHA-1: c8a9675496bcc19971e528c6a51e467bc49b3467 SHA-256: 9194dc827672786015c64543b4e3f4f229ded86e8d66beaabefee8ad6948d7ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to phishing pages or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=annotated+bibliography+practice+worksheet+mla PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2sqsi013l8h9n0d8e3acajp0q7/31547975868.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d1388135239f56f698f02414ffce2842/38237974152.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f10d52e11---83722046722.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/62611801247.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d3427ced012c58b19414e13316ee725/8376558761.pdfIn PDF document text
    • https://aashianarealty.com/file/99023429213.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/23561530400.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcea9b125---batexalozumokogu.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/xujijutapinamefade.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/piloxikubarewogex.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a10705072453966c76f7dfb20a458743/908508768.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/11114661609.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1bfd50a2---mixolozoxogewam.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zopafopofaxiluta.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/rizovibune.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609767356371c---41520469411.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v92oi3kc798slbbuhe6p1iq9di/daxemumibe.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/fixewetuwe.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/pozowuvafuzefu.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/79892489882.pdfIn PDF document text
    • https://bonacorsi.it/file/jagoloroxolaw.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/nigoxizu.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/winuvosisepuzanir.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e1s7j41mdas4c876ilp77au4h6/pebamewevivijosijorirata.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/53401163342.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad0c5cf5a---60271197394.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 17500 bytes
SHA-256: 1ea613411fa065b58fd99303c80efef0208ea8c5789a222935d98e939088f747
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 11376 bytes
SHA-256: 128a3b9dd633b17c267bcd5b060c12b42879972ae1eba0d45e3b55198404cf3b
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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