Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ce6255d6f68016…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 22:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b2e8d9e5b6f43bb5ba0fe1ca7f2ef39 SHA-1: 93370d7a7c11798217440419a34dbc3b40c6b653 SHA-256: 51ce6255d6f680165f7ee37592248eac437dd5ba36e2dfc5c4240a28ac5ec649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is also suspicious, with duplicate object definitions, indicating potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=blundell+magnetism+in+condensed+matter+solutions+pdf PDF link annotation
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7555be710---20505388046.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/videjajafutiporol.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n7nfbjq414qfp8128g31pq9s00/lopirezosotopasasegewef.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xipipimazaro.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/962a2941242dcf7bcfb6f721a66089b5/mulakegasakezakutigiket.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b180ae0b---49004740395.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54758ff8e---jefemejovep.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/lakaminazixawuto.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f11d7783---vasusupipobujakolagude.pdfIn PDF document text
    • http://princeverma.in/uploads/files/31023837699.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rmbam7mio07jkiuosdodudr9f8/gepurewufowabu.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/25014696813.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xorezamisilawovimoze.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2aa6153e0baa038fa845e06bdb12dd8a/49950938895.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/jukedukidumavezuvokupewe.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/65299668fb1183ca7f078f268b9e3862/57721982328.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5d36d0d2362ebd643bc2a7d405ce9c5b/95879023179.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vr8qoehremg8cppln7v54jd885/8033133601.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/54646262795.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608102ae916e3---fizekijulimozuverejire.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/fizinexeluvebovugipi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/93c0487a8a0c74f4bd3a7014e307a7eb/jibabubugotu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8251b49c0---rojuwumunilabosaposagup.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8e07d573---82398340514.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/goxatufuw.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/34c0c92b5a4b2e4fa4c85af5e460cd70/68142303417.pdfIn PDF document text
    • http://beateromer.com/bilder/file/22049844865.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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 18416 bytes
SHA-256: e7eaea6b5dc816d5d9dc0d54dc6bcf1e1336714be2e85efe0e2fc7be7141d93a
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 11116 bytes
SHA-256: 9ce85e537f20da0d3d4f2ff9bb3a3ccc911d81046862e37e05610bbea171dfe5

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