Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e7ded508731f3c…

MALICIOUS

PDF

89.3 KB Created: 2021-07-05 13:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7b0e699e7f1373641bdcb9b1b3ae1b1 SHA-1: efff8703060d8d90d2b58d8d3fdf1320789452da SHA-256: 26e7ded508731f3c92defdbd362e161714facd5e2ab2cdf7bf04c6fe35fe8c56
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b2to5d8arpbe3653ie96gguvc8/ravijonuxugavuberizavuj.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/7d99dba63d994f49236039d36e0833bd/dalogos.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/25211353728.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1pfa795aj7c2fam2q8be57bk5u/55898522025.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c549b7c6096---19204535626.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a2318d693373b0d15074b5e3d6d6c3bf/17894868655.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/zedibomotowiroga.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0b29edf88092e8ec354865671df08ad4/36954019668.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/49427815285.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///1870034046.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce39ec589a---3178873435.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171df7862f---mebebatigep.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/35096034745.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d038a9c7f1fbfee6fd93f72546b7b2f5/7911063473.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/josil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726097bf4dd---jukiromepikime.pdfIn PDF document text
    • http://gdgom.com/upload/file/210624220112651552ho3gnyoj6mo5.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fdacfe4fa5bc7ccb5fac9af0078902f1/75403233249.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bd63fd6f6e9e143c3a872634bb409b72/31966802762.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d447b8855dc4d456a2619a68c2a49b3d/45666511291.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a782b3f5---76809878927.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7vnnnu2tn838i3348c2da2m6u9/meruripiforosijebogidugix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=steps+to+solving+systems+of+equations+by+eliminationPDF 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_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 17424 bytes
SHA-256: 17b467b78dff118755407d13946276658ec2590b564e06eae0e3c249d278352d
font_01_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 11244 bytes
SHA-256: 741fc606f1427f9c0f2b777c16e946532691b50fbe18ff033ff5299646e9ce78
font_02_sfnt_off00013f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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