Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cd58baa60d003e…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 07:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d58d353d5bbd5ea115738b6283ba1436 SHA-1: 0fd806a8d51e529d99fd4115794c55d2f06fa7c9 SHA-256: 94cd58baa60d003e6dbb65d314a5209dabb2f2b6c70d58cfe1037216c3045d57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ibrahimkoc.com/images/Media/files/6739934196.pdf In PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/xogudulimi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/465893c4723d7b3676409621c7fd41b1/labarufofaw.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/dikijominadovones.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/88194344125.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/52814771105.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210906035121.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ec418988961a331a7263cd3491136390/82863124462.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/5250099132.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/75167487675.pdfIn PDF document text
    • https://iword.de/userfiles/file/47508091438.pdfIn PDF document text
    • http://888chji.com/userfiles/files/37776365221.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/palapademusogezotawakej.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021919949281899.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/botonotu.pdfIn PDF document text
    • https://diphong.com/uploads/vekob.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf6f49811---rulikegugi.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/mafesosutuberasipiguguzog.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/lifiteba.pdfIn PDF document text
    • http://adice-area.com/pictures/files/geninotanoteviwimegumop.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/venopunasidivitu.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/vokabenejabekujedipove.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/27875993377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=affirmative+action+requires+employers+toPDF 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_off0000aeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB0 16068 bytes
SHA-256: 4dbf5f1dcbbf452c28bd910dcdc68a190e6bf28fee18ddbcc201105bc3cd55ef
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 11048 bytes
SHA-256: 64c19a6a5a1c924b689c1c829c2187824961465adb25cf78b66400ef46d3fa1d
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1