Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6bbadcabaddd01…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 17:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 418554c8fabc9cabffa6adc36e9c4866 SHA-1: 515d30147dfa6c6b88ba2cd3cc05fc6d36d0c586 SHA-256: 5c6bbadcabaddd01ecd86c6f57b701ae54c66017b8373550b12763122f479984
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=the+law+of+divine+compensation+pdf PDF link annotation
    • http://greenhere.cn/upload/ckimg/files/202109050019005443.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/dagakisexuwapurisutolitis.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/kunugo.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/jasid.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/26255586567.pdfIn PDF document text
    • http://m2m2design.com/userfiles/23084292340.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e988b2eb41---sutozubefol.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea330004d4---dugijikakaxaji.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ea475f3356d45540cb93755be7c90d0f/jibekasuvoxove.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/78945058636.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_7867D9CEEF9C5F94.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/gokepes.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/zamugelosenozibokupo.pdfIn PDF document text
    • http://nutricount.cz/UserFiles/File/zabilixokodivoza.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/36536263963.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/22812128788.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a92db60af200db754abd786e5fbc3bda/pexisofu.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/94251814000.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/34271913240.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646bed5129---73387346659.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/15212192132.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/10c49d8e933f10e78d061273605a226b/mowetawemuxulomivoralafu.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/xubowomufovugofivi.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 18180 bytes
SHA-256: 563475fd8b047110d3672fe44f6e19877e550c51ddd9f4c7cd1fc012d857a9b9
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 10900 bytes
SHA-256: 916195eaadd360de203b9961f0c1306b8b3430c55d6ae34477262c08efb4a540