Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa6bb3ca93b72ac…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 03:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a589be34cd616cd1bb1c84495d1609af SHA-1: e5b460bbd3dd5849354624e36bfa38e3b40a44f2 SHA-256: afa6bb3ca93b72acab5962a31eefb53d7b2d5e971064dbf142f344ae489e730c
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 compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tsrmmessina.it/userfiles/files/3875840571.pdf In PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/80062225616.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8435e2fff0---dodagowowewunibipemekupul.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d47eac94f8ba151cc66a4b0d7614bd9/fomatuzisigogegipozopados.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/minoxakopepipesa.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/tofan.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/62003236976.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5ceaa6483ef68e7e67d428b161f0f4e1/fikaguxatasagabagitu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/bd208f88241090652786e51d19437277/zezotewegojakananajuke.pdfIn PDF document text
    • http://sivam.pl/files/file/40134528305.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f82f40316b166ea188b2089bdc6dc4e3/37102344334.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a68b7b715e7e6be8bceb6162cc8c4d6/repideragipitizedavodobir.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/kaviragizavubekixulekagor.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/polapemaf.pdfIn PDF document text
    • http://dgkno.cn/upload/72931401596.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2585b28bb0---gipak.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/xupifejitifitoz.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/lezosixopukafit.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609452bfacf65---51250100209.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/16032323267.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ffrotcc126u6pdaaik3ueigv34/fezubipeninibeverakujo.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/bewoxudijipor.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/vidajugajan.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7296b68ed---kagurozazizareti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=zoom+player+2020+manualPDF 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_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 20124 bytes
SHA-256: 6f9d0292f821a76459d8b356508766da85a535bd4f4056e8c13b66d35da8f4a1
font_01_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 10472 bytes
SHA-256: 22c7fa378e450a6b65545c71ac87155f5729995ad222fe75e56be4128d8b782e
font_02_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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