Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a40578f2f32a9b…

MALICIOUS

PDF

101.4 KB Created: 2021-06-30 18:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: abf80094625ac5a8bcd8678d2b9b8b94 SHA-1: 902e1f97da273f43e198e7cce54be563805c1175 SHA-256: 61a40578f2f32a9bf638fb0094816e00206037f1da090867f6bbfa16495835e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0012eb7e1b---36729566108.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff7d9f29---26511356874.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655dfe7---5511217300.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/gewaxalire.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ac351a6f9ee---bupawisitavipejezipakafup.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5bffdb40edb6b8ac4bfd6931b09cf7e4/tobozimimevurob.pdfIn PDF document text
    • https://iword.de/userfiles/file/33788340081.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/74376763375.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/3db879d9559b292c5aa10ab903635b9f/14489137377.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/37444288032.pdfIn PDF document text
    • http://texmet.pl/userimages/file/teweditefa.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/15399059302.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4e16f64---peven.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/fulunuvutarezame.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/49303709356.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609579a5e0aca---80552802487.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/58fbbf75ef683d06a5aaa594c8b6da71/fagidinevetokitijub.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kevabanoxopabasazukex.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099043811dd7---36508635357.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078e73227676---livipuro.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622680245.pdfIn PDF document text
    • http://renovator.cz/files/file/37165959195.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/81619799674.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/fevuvepexala.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/89677769488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=five+whys+templatePDF 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_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16640 bytes
SHA-256: 7fea958903984ac0837a96826199220e5aa961526fe7d26aa502ce2bce2394e9
font_01_sfnt_off00015770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15770 10436 bytes
SHA-256: a01e69884fb12e0a4938bf5708f1efae43a9e5fb53f6f6145a167dac4c2e872e
font_02_sfnt_off00016f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1