Malicious PDF — malware analysis report

Static analysis result for SHA-256 75df01ed57cb40cf…

MALICIOUS

PDF

88.8 KB Created: 2021-08-23 13:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91879fd97506954b627dd74144085923 SHA-1: db059354b5a9657f915e9c9b1df71f6a58349159 SHA-256: 75df01ed57cb40cff7bb936c7bea1411ab27b9f6c67f50aeb9e0cf901e2cb219
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 functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised WordPress sites and other disposable domains. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/85570116717.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2i2doo90i1f3ptuc1ehbb87r1o/28133678533.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e9344b1c8a2612e95e6416bf57cb03bc/7605995510.pdfIn PDF document text
    • http://didula.ru/img/file/14566048440.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0ef5a09a60c6285504ff185b2bbc01ab/2485602256.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b2f8b7f3---kuzerogabobepofukekona.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2d52036f---29617323951.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/bebovalesuwinixukogu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da6e4f343---pizojubabowojefosadi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cfqlg4pcrn91lncv1m3j78lh5k/30289642300.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/fufufedalasawuxod.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26b20333a---39484715796.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ieg773gppg02liqhl24dn7b0s3/53462346762.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8049c3b2fc---71431878221.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/46326546648.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/77001953019.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/mudigowajoteme.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/72164431175.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/16080447785.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/vusovud.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/talozalodit.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/84773585531.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/ratonovabejidumirupexiguj.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/13f8fc589941a59c197e5847f24d14db/xoserebinik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medal+of+honor+war+chest+torrentPDF 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16488 bytes
SHA-256: abf87808c4d6fd8cfb9c3e2750c6e1ad3224799e1411704e3dedf1d9675db402
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10560 bytes
SHA-256: ab8433fb5f2cbd50422353ad5a3177e2c3123ae30d15fc020f67d4b721db17de
font_02_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 21056 bytes
SHA-256: a8930f20169a038dcc42cf46f82a2306bdfe807ffbe3612f5f5722439c9c7fbc
font_03_sfnt_off00013bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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