Malicious PDF — malware analysis report

Static analysis result for SHA-256 26513fdd30e9897b…

MALICIOUS

PDF

77.8 KB Created: 2021-06-30 05:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 582830d19e02131d7fe3a3dccdb97216 SHA-1: 6e2997b8963f4db472f7c5758d083aca8acbe99b SHA-256: 26513fdd30e9897be82e317e4ef5b2922ba9c61823e4434ac3c7dcdfbcfffc6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=non+forfeiture+means PDF link annotation
    • http://analogsys.com/uploaded/file/1683843812608c5381d6dc2.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/6928036943.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877c9758f1c---46487591044.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/38f1dee6906cde84d6dea7f0407bd2ee/jigimixus.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9037ecb3d80f81c8779fa3b025ab7750/98565179450.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/rigametorobi.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/71956442640.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fk91nbuo9v21h16nt7li4i30ag/pawulijovozixupo.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/61572091428.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0475cc080dea130c0466402d561264e7/mopatipawalesofamivokuwaj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6a40b5f5---22916057874.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a817a1d3c13---rogakejubekuna.pdfIn PDF document text
    • http://mosjob.ru/images/file/41429371397.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1c378930098a0b6cab7471045cfe878c/goxuzuje.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d36ea4daf---modomokusubemubemiza.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/44890834969.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021060120312680554.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/linipo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab06cd682d---38441740805.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/gajosu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lk5dr5go9h3qaie7ecv6apf2o1/73495110285.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e122d43f---69039838880.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/dilewewokevopexorigikufa.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/dogesiworusaduzosevefe.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/40547461951.pdfIn PDF document text
    • 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_off0000cc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 10408 bytes
SHA-256: 10edb375984337ff8636f6f1f5b7f9e9b9eea1a3902c239b21d48da50e84595a
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17356 bytes
SHA-256: ffe81c2503c1ca632eda5c63e515afd239d5bceb9adff46da29e38b636258f4a
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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