Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a0b9c3887af817…

MALICIOUS

PDF

155.3 KB Created: 2021-06-26 02:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0ca0b553379929d1811b3676392efb77 SHA-1: 57ad76e25685dff4a6c5af2b3883d7e7636e1c7d SHA-256: f3a0b9c3887af817456a79fd7f2a75f433b04e2709b6b42753818cec379adb5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9369

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://crysiq.ru/uplcv?utm_term=sir+alfred+jules+ayer PDF link annotation
    • http://parkhighclassof60.com/clients/871169/File/lukoxaxulimezav.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe284a1bb5---36262064488.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29a16fc03---meweguvujananuvisoku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23564ae27---mitonar.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea35cc9cb6---47787095869.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/dejenasonasixadevariv.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b136212741---53217222387.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3fb19017b---zokadun.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n1a2uhi34493h6c82rpq4pv767/bupadajugimemavagonabi.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/0d6db911357574d3b249d198c4740333/326516732.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b513eb528---31652694146.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/tegaso.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/64096484660.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2638a8d5---74633335640.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/5515289121.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1b3bf156e5d1bb890f40ef1ba73d0aef/7743506626.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/bosemodavukexemawo.pdfIn PDF document text
    • http://learningkey.org/userfiles/betepegasovugamumokelan.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8qjo3hrqsmmdn3a06qud8o09p2/gopajapunudade.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ls89ic833rfu75l1jkbf2ok534/zamujubeka.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9941b55e7---38226628488.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/81f4c1af32306536b220f2589baf7f64/sipaseviramisojujud.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c280016201899923a2c62430881dc03/ketatodekop.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/13996224757.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b779bc0791c---15110438688.pdfIn PDF document text
    • https://peterdegendt.be/file/94256750908.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001874e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1874E 55456 bytes
SHA-256: 2554f30cad35301a2303408ca50a44dbf850638db7aff3acd592ecd0babccb10
font_02_sfnt_off000217e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217E4 10444 bytes
SHA-256: f7a121a2a0337078fc84b9e515e0ef61fe0466de69ed4b2b45225c708a5b171e
font_03_sfnt_off00022f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F9C 17484 bytes
SHA-256: a632f923ad6122cc1e82ee2facfdb236f205c733c0eeb05c4bfe6f502f329a09

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