Malicious PDF — malware analysis report

Static analysis result for SHA-256 997798544cc2f7a8…

MALICIOUS

PDF

106.1 KB Created: 2021-08-20 09:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 12cd0a644b06f7425552739e63912906 SHA-1: 06717034e022505adb4cfda1d1deb35d64987164 SHA-256: 997798544cc2f7a80a062ac42e3344fef5159e58de93207438c0c70740ab95a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users, hence the inclusion of T1059.007. The overall pattern suggests a phishing or malicious redirection attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://daynexweb.com/upload/ckfinder/files/zixosuluxeziduvo.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29723b5603---sitetenoron.pdfIn PDF document text
    • http://enricobarraco.com/files/vidudadokazusepip.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fad284ee8f3ed69e6bd594bbbcb1cdac/derijegukotodedugozage.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/107982968.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/xotunolabejawezukuxim.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/51423601516.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/6m64u9eoqptegjjklgibgkv4e0/xuweri.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0903bd27cbc2fa1b668862c58aca35e4/rovedikifuvunivususep.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zudowagesese.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/zeboz.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3a1c547c---katekugeviferupuxixukujul.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/32be8de11c432890d5bed2a587e89dcb/jabagedabuwofibo.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-04/images/files/metazewemoji.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b196727f62---bulemizukevagexigobuni.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6enrmjmfplpeq06uf1klr46hoa/98728969032.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89650e0a2---gasusulujuwokode.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34d117662---8772283639.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/weruzinas.pdfIn PDF document text
    • http://meskerjager.nl/media/files/wirukon.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/77907400670.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724abbb1310---15075352952.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/40901779379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=como+convertir+joules+a+kwhPDF 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_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB0 11000 bytes
SHA-256: d09b3d624cec2b8f430c58dac5a16fe732ee99ec089e36167815ddbe7b1354dc
font_02_sfnt_off00016918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16918 18184 bytes
SHA-256: 17cccd48cdceac97bda5887a0bc9fb3952b7529e8f6c6ba406b27ae3b9d4245c

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