Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed71c6a42fa31cdf…

MALICIOUS

PDF

81.6 KB Created: 2021-10-10 07:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 02652c9abb6a2e845485744436525eac SHA-1: 357296f07d82ba159adef0cd0052b21a691f0101 SHA-256: ed71c6a42fa31cdfc845f87e3f66cd48c32508b574943de567cf8027ed180f6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=the+intimacies+of+four+continents+pdf PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615833ca6757c---silunavaxuzenozalajawevox.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/52772330882.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/tevumoliripimed.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aa8c3c93---surazadelaxobimirifakajiv.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/5519150869.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/reremajepopaxew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156f48d4c005---53299961310.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/005287750f926fee723ee07750802653/rikim.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/79712399311.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/sewadi.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/16545470917.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/2649206405.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/timufaborawudilopir.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/22/57942165527.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/bogeguxexetawibubago.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/20164235115.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/144174336161466df8cc944.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/082305042283.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/lovebamitobodupotafa.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zidugeririliposomigak.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/sedafazojemimozuresivi.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/52076914109.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rewevejotojeterurawen.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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 18328 bytes
SHA-256: 673facfcaeeba36b061b4fd3797748fb20e64bc71103ceaab984b661e8970db6
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 10904 bytes
SHA-256: c187ae6639a1b3de8e1d78af59431a48f138aaeb6dac16200ae86a6580bcd0fa
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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