Malicious PDF — malware analysis report

Static analysis result for SHA-256 80710e66f31bebb7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 16:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28a7b9094ab6c43ddbf95f18804aeb54 SHA-1: 154f47b8629213defcfddac5641c0a606ebf5be1 SHA-256: 80710e66f31bebb77676f50a34389f793e700ff5be6107184890119f66a5836e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm, with several URLs pointing to compromised WordPress upload storage and disposable hosting. These links are likely intended to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://unicorn-furnitures.com/d/files/kagamubik.pdf In PDF document text
    • http://worldprint.su/userfiles/file/9750618437.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/sofidebuveronitopusejos.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/dukavurugiwevexuvamopape.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/vavonuniverakupefa.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/26775069675.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/27801506327.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/jogixenirulibibumer.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904015946.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/nezej.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8ae2c134274cbdd26382e3a8ea36fda3/fuvotumebodosuzolat.pdfIn PDF document text
    • http://portableandcool.com/files/files/jipirimixo.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/gofis.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/2111887829.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bodupaworowu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/rolorozosazemebizamoli.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/48964127705.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/475989128.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161392998e4f8b---towulifukatijowivige.pdfIn PDF document text
    • http://anindecor.pl/files/file/2455879832.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/votasomumiwonalogidajunir.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a071d968a01357dc2d496dd5d47dee86/70962180584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+cash+app+money+glitchPDF 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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 17712 bytes
SHA-256: 358ac2254c513a5d2424582407a0cea34a83043faff8b37039c70385c0626780
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 10912 bytes
SHA-256: 84dc22c9e365fcccede1a18a2301bf0826cc23b519966c2ec6dcf2aa771e03b1