Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64b78443942a850…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 08:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dd17553e4f9ca606fb307cd1dac614e SHA-1: 8b7264e81adf0e29b82214af603f4490a09049e9 SHA-256: c64b78443942a8508c2cf0f893b9b825e037f41a0db83b8479dbdfcdd6747486
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ce44c2d15386d0cd7936f9aa9a9fd7bf/71951647323.pdf In PDF document text
    • http://diysmart.net/userfiles/file/44147093363.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/piwanefosavi.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/65188772215.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/mekelumuregifez.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/21878103626.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/bukebewovisujakobominen.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/jafebobeguvupavikifovas.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/vuzivitivisajaxiz.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/85604861955.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090506095173499.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/68671792396.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/949962994.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/08v7skgp4tm33oblversb4grip/mamedozuforudepumipuv.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/woxozebevi.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/gufutoj.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/18089724526.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/wipunofojakoweb.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/11a8de0b311c6aba5f1b72bfd309aa96/20476816518.pdfIn PDF document text
    • http://odumakus.com/uploads/files/42240654800.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fimoralovo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/rurododa.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/gagitifonulapuwiza.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/98626810174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=grand+theft+auto+san+andreas+1.0PDF 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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 17144 bytes
SHA-256: 1856b87deee9f1f89ec8d50ffccf4154571f8cf54659303b97b650ec7ddde3b9
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 10692 bytes
SHA-256: 58059c714cd6f47bf315358439c15016c4552b54d1a8f4b2d523af567befa876
font_02_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1