Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5e56bd6d8de8b1…

MALICIOUS

PDF

78.7 KB Created: 2021-06-27 00:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18dd1535bcea40b28e2e50d93fd3d435 SHA-1: 05af135f4deeb23fe80b0d791cb89e24517c8e61 SHA-256: 1f5e56bd6d8de8b1854ea72754f673dd5aee157647b7c85a0841807a8b320561
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF structure and numerous external URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=ordures+in+english PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e904069a1---79492941557.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/sugurib.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/45809579859.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a907e812bd0c965fba33d56ed47e9171/56880331247.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/39783689741.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622819780.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/muvex.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jafamos.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216241757467269.pdfIn PDF document text
    • http://www.toptehnik.si/images/50544736588.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/13339614132.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c415779cfc---medivuluras.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1492726de---44329877535.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/wazimojaledek.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f17ddc754a5b5093150b6ca7e182ca59/jerorixida.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/13557258065.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/jazegonufadol.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/basozujadem.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb0694bda---23796762262.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7f1541ff27b39682eaf5c55885df406c/ritanu.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/2472e744c96df755cb84b1f64e8c6a9e/65714965926.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/87746891518.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4s0i4685dv8lj0uu831r33t5rg/92021234538.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kigunalezorexewobokimo.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vageziredowagilabejaxi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd51c3df81---goxagaxakebetujape.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_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 19012 bytes
SHA-256: 581bef093ee2574be8331e138b9b7033d6664d8d3577dfd761e4668905db53e2
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 10272 bytes
SHA-256: 294c1b981ce0e54c440b1758b63e0595260502e824ebef673e1c58a1ffe4818f

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