Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47a9aa8ed0b6656…

MALICIOUS

PDF

94.4 KB Created: 2021-09-03 20:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e3a0db16e14f0ff936ba4abdeacb7e7 SHA-1: 636350a7bdff6a8d8bd11568f14157d7277470fa SHA-256: a47a9aa8ed0b6656d5489ec5c49828d06905b41414de9056800d836068c3303b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://smartcevent.com/clients/871459/File/91750137561.pdf In PDF document text
    • https://lienlacanien.com/img_pages/file/76674203014.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/nifapekepobaxoxadixu.pdfIn PDF document text
    • https://latework.cz/soubory/gotinodopomunefute.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/julerizasutitidiralexus.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/82885add0db9c3f58b3cdd3b3d016920/75432214974.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161251bbbe65bf---pukedisapivudeseroxasumir.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/vamanogetidaf.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df6b78028---jironefoninikojese.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9cf0af8694932addc60504e48a5c3951/jivunowuduzetaza.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fj4qvnhifr41hkijekfe775uc2/ladafobijoviwidosexawat.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/5300210424.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc813e7762---91506018188.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/goxodaguzisakefuve.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/293dcd13e1a796f2274120b6a794afcd/tenonikuvakivulabulidubaj.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/jatagofuzetetimotagi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3d8698e7f16a9d2d491f79a0b4d4bcac/69132613217.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210624215031.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fme3i7bji8q764t6g6daseqgg3/28962808770.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zipabubagusafezamojuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=instrumentos+de+medicion+en+investigacion+cuantitativa+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 11032 bytes
SHA-256: 800df288dd50481691497ea271269ac67f4214d3d34348f10b033e3096eae73e
font_02_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 19800 bytes
SHA-256: 3d9b2b33e3bb8a3e6678ef21aafc70d5a2720679cd326ee1b7276fad2ce66ddc

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