Malicious PDF — malware analysis report

Static analysis result for SHA-256 8934a33ee72f0d4c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-19 04:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1309aa4e8742da0f2447337a509ac401 SHA-1: a6d0478ed299118c1e211b4e3f43f3a8e62031ff SHA-256: 8934a33ee72f0d4c6a6435b0b8ed49a1c353b3a41d38e153836e33432c6e9ac8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct hosts and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.sanruou.com/app/webroot/uploads/files/satelivajijitobitixugafop.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/p7trjrsfjit3hfgpv7qrj2ale3/61254120368.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/wusezuzatefujafiximi.pdfIn PDF document text
    • https://banghenails.com/upload/file/pozivemonusububazija.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609893a4d016d---8108599633.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/tekafiworarekotedo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/64279057932.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghlhvg0kn8hhd5pmcrl6ds3bon/27039834129.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/64776332857.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/40523335040.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/diboxijewitatexowez.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3192e68c1e---siloxinosewafimox.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/sanotodeluf.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/74286944259.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/42a6e467c651549a0e6df3a4910227d5/81813479628.pdfIn PDF document text
    • https://emmaushuis.org/pages/10377002978.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121f2891f2---75115289666.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/52960677085.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/addf36b805647cbfe50626922b3def48/47837659795.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107edcd3b7c4---tamalolixafotenafes.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/gifatomudezetavologivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=succubus+mutagen+locationPDF 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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10788 bytes
SHA-256: fb208c43ec0fec483f3226652395e1fabf0a4c0b383e18dd52ab5e0d24778039
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 17356 bytes
SHA-256: 981a87b21f455bfa8bdf4d1cd69b93764c1153101d1b92360d3267ebb502601b
font_02_sfnt_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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