Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bf78a5f53ad3d0…

MALICIOUS

PDF

95.7 KB Created: 2021-07-05 10:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 657793f82854e3216e4c60c9ddde4f5f SHA-1: 3f6a5ecacd13f5ba0c45895018fff9ebae2782c2 SHA-256: d4bf78a5f53ad3d07603a58311c537735ab1ed85ae7de909bcac68a802f12dce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://reutlinger.pl/userfiles/file/pijefetakobofu.pdf In PDF document text
    • http://slsnn.ru/content/file/93112262762.pdfIn PDF document text
    • https://medtek.vn/storage/file/11406769248.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085bda8ac7ae---dagitifesa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b48653506---41514734760.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/fegazafewisaj.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/32442686708.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609903e342200---dekawolojatadexakesor.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/pojaruzonuwow.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7c2ccb1c421ccbe86c97c2ee726fba1c/bafifomobefumamavosito.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8ohb35lsbvevsc9d8669ie0l83/meravosulumabozit.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bad5c4def4221bda723a9071ab3d7dfd/lelezujuzan.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hr2tbrm531r6c262dgb8r47829/nonufiwegubezuxodifixip.pdfIn PDF document text
    • http://fotossc.pl/_files/file/dexazewi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb42a0f591---fosifurasovopapif.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/zilapab.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941d9a94a1c---52810353993.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/33274272979.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/94598336702.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffee06d6c5---22386710030.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/11209219004.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/95984492610.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/95dc1ee68d5a4585105dd70d0e533e42/58907224909.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/do49ll4k1clb17g5hd9ftrc144/zibatamupoxagazifejedebox.pdfIn PDF document text
    • http://idroter.org/userfiles/files/91139490745.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3ufnf1t95nofvumtrhv2g57k7/9246524899.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea466d3fb---pixawipanolev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amazon+technical+program+manager+interview+questions+and+answers+pdfPDF 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_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 11508 bytes
SHA-256: 8929e6658f60bdafa633f217c79521dc2f0f092dc1005580410f26d2759efa46
font_01_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001420f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 18372 bytes
SHA-256: 647a4aea2a77d599d54413df8d4554d13d9e6a0d54a74e93fc9dec9ff50ba798

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