Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb06a42e9442cd7c…

MALICIOUS

PDF

78.4 KB Created: 2021-10-01 07:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4327e39bb5a423dedce7d588e715c772 SHA-1: 7269a388eb95318f3c82dc21fc4d65d896f465cb SHA-256: bb06a42e9442cd7ce6fba9e98d5a3173c7efd69d7e24b8e20f8040ee7176d290
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://smshealthcareservices.com/ckfinder/userfiles/files/79352441477.pdf In PDF document text
    • http://dmhu.eu/uploads/uplib/file/xafakozitomef.pdfIn PDF document text
    • https://coevent.ru/upload/files/61109079419.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/mapuzafek.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109300759478459.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021923051311499.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7002ebd5405f8f2f01001a4e58779db1/pezir.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/26e53683e34646398d374acaf1114961/tijujumupesilaxebem.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614182a2cb9ab---5354883913.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d91886c1972a7fa759fd298db71fbcd4/56817843443.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/rewunilexusasiz.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/3477276542.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/59619363925.pdfIn PDF document text
    • https://kimcert.org/E/file/7738115469.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/392243081.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/sd6so2irqqgn7c98u17j11utf3/98163355577.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/37740974058.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/liwedupugumovutosibogexel.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/88244504477.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161504630dff2b---rinogaviwujoko.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jusutinugok.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/28498490644.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/50869385618.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8052eb2d8d2b9efdb3a898f38f5b8921/tijudapokeparinigibojisa.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916352397892.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/dukalojenupemaxixab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=miami+rope+hero+mod+apk+unlimited+moneyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 10788 bytes
SHA-256: 2296e0eb2675c3388ff137523ee94ba0164a00c2e1101520546955bb3da3e0b0
font_02_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 17472 bytes
SHA-256: 44a8e0789ffe83e8cecd66d986b77f4759d765e6ae346997c212233b5dcefa98