Malicious PDF — malware analysis report

Static analysis result for SHA-256 0681df23f75b1c18…

MALICIOUS

PDF

85.6 KB Created: 2021-08-11 20:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bf8d3a1bd0e6fbf96cae7027d5db889 SHA-1: fdb6ef279958a1eafe6b6d7845a690ec5d35ecff SHA-256: 0681df23f75b1c18c47de2996ce2d931df1451e34f220252c76fe2f4a8d41c32
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://hondatayho.vn/images/ckeditor/files/kimelomotutewo.pdf In PDF document text
    • http://dlmberatung.ch/userfiles/files/dametiweluvuvabupurigusir.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d1c1d6bd---vigofizeb.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9330e7b991---55876704492.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/33b74db4242e4273fcf432ef1816c3f8/31961330279.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bf656adbab9884f6be379db2ecd9c694/77506417937.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d259fe6c035---62355685202.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/47286017609.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1bcef190fb181855e0052d16dd4f49bc/domomojokuraloru.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9d419a90---gazakununivewe.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a839a03156d---vewisiwimipixo.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/68513006834.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xepizetirukaxolo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/330ef9dd3c9124bcb2084b3e6f029433/romisagibunum.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rj1e5dndn6r49rcl2q2fmeorip/dulirevofebigivibanap.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/eed2266f241dfb4834ab87e4bb9acf10/fezadego.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jiluxiteporevapetuxepok.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4620610b---83838635402.pdfIn PDF document text
    • http://dothi.info/images/files/19275450545.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/36075004480.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076316488603---fewixanul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wais+iv+manual+tecnico+y+de+interpretacion+pdf+gratisPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7769dc2343---73138066452.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_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 18368 bytes
SHA-256: 21111f0808aaa00e8c6d69fe9b42c8751f6d91198ebd52f07bc00e1a5231f624
font_01_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 11236 bytes
SHA-256: d0c5952a88262e0c76e4104b8a24b158b165bc4d2812763c2c606b45d50f28c7

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