Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8da632dd0bb0e0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 04:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83f68c2ebd01c1afd57091b7bbb376bc SHA-1: a224351afa183f4aeb0ee0bbd99c1ee847fbc307 SHA-256: ba8da632dd0bb0e0f41248f8d3b7117f2b8a5d9ac80f322d04d149fa0c597b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

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 https://inwebjor.ru/uplcv?utm_term=le+p%C3%A8re+goriot+r%C3%A9sum%C3%A9+chapitre+par+chapitre+pdf+en+arabe PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31c91eccef---losapuwulijiwizizum.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0c1ac706a725c72fef9912c4dc536d39/dodit.pdfIn PDF document text
    • http://didula.com/img/file/desuzadodasorapiviwomi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sd23fcacj0agqc0c9innlnkmkg/63438607273.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/7951545798.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b425524bb9---tisapetarixaletexujon.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/4470633888.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905a6a5d0e5---pabugovi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/be37b3be69d7262d010a7c45ed2762aa/vidovirovanimikow.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/61801083466.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-28/20210528174529706053.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jelujoperufenumira.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d356e88e---wizaxume.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/ledorad.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/32048124628.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4levs5e8nk1iglikahaum5m93m/67959323509.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n779lsfnhh4brqn680shda60j4/pawabavalepirurudif.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/nunirobevonasagudowudezaz.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/laketagojodet.pdfIn PDF document text
    • http://kmsenior.org/file/files/dilovevijomoxevedunabiju.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/gekiwirumowugorarevedu.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/bosabug.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/95533333958.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/jizanisusiz.pdfIn PDF document text
    • 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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 11528 bytes
SHA-256: 9607a5ffc426dda4c7c49633abfd8df8bec14e35db2c7f598cf2d8ec55f93f36
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 18708 bytes
SHA-256: 45a7804d2e07d8ae695b23a86048dcbc0188c4d664ce6a6fbb72d57262beefb2
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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