Malicious PDF — malware analysis report

Static analysis result for SHA-256 28972490437d9eb2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 16:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a22a305aabbb3bc45df97a353e01f6e SHA-1: fb6c58c1b649f3f971f870fccf1f4cae83c3e594 SHA-256: 28972490437d9eb28b9ca052684755643b3341886a01606607b9bb78d82de521
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zatexpress.com/upload/userfiles/files/jisusasebapatev.pdf In PDF document text
    • http://cuboni.com/uploadfile/hong202109022316558822.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/35314779459.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/dovebev.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35c5c41360bf555a84a4ca1004c162c5/zagokexez.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/luzajuretafakukalasifob.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/matuxirefowosugiluj.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/sukeresosa.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/wadiwumesupinexet.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jagazorojixofododexudu.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/33926592999.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/66448444047.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/92026832278.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/24513638627.pdfIn PDF document text
    • https://shevian.com/images/file/rezogaxetizowojokediv.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369cc5ee104---xonuvijivamif.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/81892323537.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/19142503456.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090820205411822.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/93852049065.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/kemadotar.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gajuq3df5ntnbq0ivop9patnqh/tazerimubidajatevis.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026c759129---ruvux.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80322563104.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210906_818875BFFDA3E3F7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=books+to+read+during+pregnancy+in+tamil+pdfPDF 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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 11320 bytes
SHA-256: 9535b440422af304a7b7984298b0f818347351cb4d3d6433a497092d0c652900
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 17640 bytes
SHA-256: d530f20c5875afe723122260d2a08e85857a02c3760b18baabd2b682bd7c0f99