Malicious PDF — malware analysis report

Static analysis result for SHA-256 d754b70ab8486d66…

MALICIOUS

PDF

88.9 KB Created: 2021-08-08 14:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1cce86aaf763ce2a8a3ef346168d8a96 SHA-1: 44fe06bf9e8777ecb47dd16db78675927661a38c SHA-256: d754b70ab8486d66ea38cb5cbd11bb47ae76eb61c6632662b0209b5a19e8c73c
156 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The primary attack pattern observed is the creation of a link farm to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=para+que+sirve+magnesium+oxide+500+mg PDF link annotation
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a32d55ee3801c9530ea6c793eee52d12/62610785943.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9e9be3d0---wibadugogisilijebebiv.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/sitetasanegogatuwuruj.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/62157567475.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a766d2de29aa71a90d523162c2f746d5/66606800580.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f24eaa213c4513fdbe9747784477437d/27489286828.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/15319963334.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210704003537_989xz3.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02abb3dad---87205959956.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/58882601945.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb083e1cf---60496625133.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/13653245476.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3b21f460---xasuw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/911gevtu4iimehgivhrln837k9/fufizawomoli.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a345c24eb9d---botejudirasibemamodota.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/4786078362.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/42185606847.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/52536068403.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160820d016a55d---81303680301.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d08758fa082b136b086d9ed2674c3bbd/16067195475.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a38d0c15b278493f6fc769f4c47c3724/84324208032.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082980f1ad4c---pajakelovulexakozafasoxa.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090f47b5f913---52349287356.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_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 17484 bytes
SHA-256: b7ca0bd4be7e865e3d4dc3e619686801fe027b370de5962d1b521dc698775f45
font_01_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 11116 bytes
SHA-256: 6d17973800c3b75321a773ec7c7b19cc4766a190ebbb3d1b533161deb05d33e3

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