Malicious PDF — malware analysis report

Static analysis result for SHA-256 081502d2e8b12202…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 00:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1ce890dc75447aa2557821c0e7a866c7 SHA-1: 0c3233b0f6ec7397a0f056ef952853922bf3f29c SHA-256: 081502d2e8b122025305d0865dccaed30fc34c4dbd05e9a177ba607b6d77683f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7f4fe4e3c4e8a08a69a55cb4d6b270c4/bagikemowenazivapu.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6bfb2add---lisitamalirogerex.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3f87c54bd0c0650c7697ac50d40fc06c/taxexubebexe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1en4qaege137gou4gqpq3pjh75/61853243580.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/vopaxonumifudi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tanodovo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/rejarogisavijipodibunidis.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c3d9c386---lifisik.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/89820491187.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/66362378807.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/nagaf.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/valul.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/lanag.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/lixokemofatenonafafafuv.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/kizipesekuzonigid.pdfIn PDF document text
    • http://vina2002.com/uploads/files/ruwobazose.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a477390343a---takotif.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/26/jutaduxukupifetubonik.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48585001347.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/bifatumutut.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/81745782582.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/dudatejelesuxusi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/lejokazoravinunafoxopo.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/69138633280.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fed739f72---fobabaxiwivumet.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/9775831834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lego+harry+potter+gryffindor+charactersPDF 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_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 16352 bytes
SHA-256: c26202c2f9b6b0dd35a2aba33d9e714fe698cc58e882cf26867bfcb8f56044e0
font_02_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 10924 bytes
SHA-256: d9769d1bf6110cbe62ecc88909ff3479cf95ed42a05d9960b352b34f6480b45e