Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f699b48d56ac505…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d3a2303a315f783bbdfdb3dc89d219c SHA-1: fadf60092a658c83188718a4e6a9b1e315bf5ae3 SHA-256: 1f699b48d56ac5054d13c713374be67285d533ff8f903ba13b35f3bb22cdc8b5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting domains. Several heuristics indicate this is a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mirokexepikevanomemaf.pdf In PDF document text
    • http://aylabawadi.ae/userfiles/file/rupunad.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ketitugejod.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/rojoxiku.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/23388125563.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/42251197615.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kobodob.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613956edd33f3---92172807289.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/64581047560.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/1621892194.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f43efbabe6be0ed309a62b333a73de43/jerozedelidedonoboja.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/tadijususizot.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/9353950596.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/17625928482.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/samezabokazanolefiwo.pdfIn PDF document text
    • https://codecs.ro/images/file/92034859928.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/33289156692.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/c16rvv37hra1dca2app8nmr287/30181971608.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/96733697708.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kidisatefafopaf.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6fd196d9e---37359945785.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/1663881569.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/nejuwopisov.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/podedolefafamejite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=heroes+of+might+and+magic+3+mod+apkPDF 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_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 18976 bytes
SHA-256: adb854bd94516ce5d0374b4f5be4079746fd524125b08b4ea36a42c75f90fbca
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 11276 bytes
SHA-256: f002bd832058d4db72f17772b97fd0f7e84ff26594950f5b4b481978e9fb1b99
font_02_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1