Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c944645b190dc2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3e5bd0d60de592a10e8a4a90ba5d52d SHA-1: 204ad72af84a7b71b31dea0f6aa935a1f5d9c96c SHA-256: e0c944645b190dc28f1e8c6346a6a81ac9eea4703c8cdeaa7158146641666ccb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ba749835---63483770292.pdf In PDF document text
    • https://agriturismoilcolle.org/userfiles/file/85957090133.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/35353434294.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sudenavun.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/nasugolowux.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/538813998612fa89e2640e.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b1906c362080ef93200667b2020762d0/19964015703.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/sedumelolu.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22744419174.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/95384309138.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/67958667603.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/9929737243.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/25647044040.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/16o8eko18f54c65rgo0gt61s3i/sisib.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kojoxejepot.pdfIn PDF document text
    • http://rivucota.com/upload/files/lewanubelodutaxetexefod.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/joxasuwedazolos.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144435914fb5---51784455285.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/lisewomesawesefup.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/13128429596.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091315003373499.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/32218984349.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/67555607998.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/4425053929.pdfIn PDF document text
    • http://blueyee.com/upload/file/191354373527.pdfIn PDF document text
    • http://husplaza.hu/editor_up/digas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simplify+boolean+expression+rulesPDF 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_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 17684 bytes
SHA-256: 3bfff18ed81ad3b955f9bd3159c9195741bd744bf4bf7d8105dba988b761438b
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10952 bytes
SHA-256: cb82d43ca2873f1c29041f4934c71d344c9e8784b4cd85a8fc9afd91510f954d
font_02_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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