Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df52123f6a66a1d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef65d075ffa72d460c28f19a76c281f0 SHA-1: 254d2b8afa34b74db1bec7df4b80a218989f5c62 SHA-256: 0df52123f6a66a1d68c013f069f6b0131d53625b4dfaba9c41ca00f15314d763
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially compromised websites. The primary purpose appears to be directing users to malicious content or phishing sites.

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb188164ef---37348690714.pdf In PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/51945443993.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/zetemakukolomivan.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/78468086581.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/25115744491.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/rokekumemonevorasusipu.pdfIn PDF document text
    • https://ms2oke.com/contents/files/bujovufigoxon.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/rokepefurejim.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/64768843215.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/nekurutozizeweg.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/45683675777.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/78413300201.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vulurasabimuruxojomivanaf.pdfIn PDF document text
    • https://bachson.net/upload/file/nekikizapumerovaguv.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/guvovebepinevowunilabodoz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85097540756.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6ed41da2565ed7814ed0fdf054ff2a10/vifuvebusat.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/1004472775.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/35403569755.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/7887006518.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/padosovoxalapidokutifame.pdfIn PDF document text
    • http://kgmda.com/upload/files/26356020899.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/mudujisumapeno.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ol492reks9qpah9doc05ql7e37/lopul.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903031406841675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ppsspp+use+cheatsPDF 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 17928 bytes
SHA-256: a71fffd32eaeed847ea7070a5be26b0acdeffc03df3017120a385911a41fbc59
font_01_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 10108 bytes
SHA-256: 370e4ced7be797b4fae6b13ab0bd0c2fd2862458cddab7b14ff3dddb92103fbd

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