Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7af0f9c1debf6f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 10:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22ee4ebf89c0413ce2a86437bf203223 SHA-1: 04fe21ef0fc8ac7f905495cad181afe1aca44929 SHA-256: ab7af0f9c1debf6fb12d900f2621d01684d6d7a1dd67efd96b613e6d5796d20f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chataigne-cevennes.fr/imgs/files/86129712203.pdf In PDF document text
    • http://tpt.taipei/asset/uploads/files/5242252093.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/mowidugajovederevot.pdfIn PDF document text
    • http://tai-group.com/upload/files/79480795425.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/80517239428.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/kuwiganomajuworulegu.pdfIn PDF document text
    • https://hobbypet.cz/files/file/90629601994.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/832522942.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/60735007146.pdfIn PDF document text
    • https://dafelia.com/files/28028867572.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/71748162543.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/72952948552.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/vabotuwiku.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/78330671653.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/67c8a30775e26347168f666fcfffdf9b/39364179034.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72dccf182---46021630929.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/40878974332.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/suxajebapesujezujisinoj.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/3337880387.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/33804875039.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/pupizimukesijitotewi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0f7d7ec7e9ce477bd24f94f6bd865c3b/ditulizupenotoxejukadewor.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090704053080.pdfIn PDF document text
    • https://bachson.net/upload/file/4084825691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=describes+a+nounPDF 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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 17348 bytes
SHA-256: 35fdfa1617f7bce8222dbed521887212f62edc33aae7ddf04eda23fa3b4f81be
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10320 bytes
SHA-256: 8517f778dcacf2b493ae7a94fafebbb5079fc1ef5a8e45c9b9f1736147412d0b