Malicious PDF — malware analysis report

Static analysis result for SHA-256 342ceeb7335c3db4…

MALICIOUS

PDF

76.1 KB Created: 2021-08-30 10:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5f3f2be4f654da9ec1c7ba05e48609a SHA-1: da839857d437b6d081d647785956a66d42b376fa SHA-256: 342ceeb7335c3db43a1dd8500637ca18de13eefde092bf7f6cc8c793278d296b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The PDF structure and embedded links are indicative of a spearphishing attachment, likely intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://medvor.ru/uplcv?utm_term=linear+function+family PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6l5emeh4do0f204eh7moj4ir6t/91146053684.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/687e2fa480d9fed27715daa55b47f031/gexujozarapuruxu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612845f68fc58---61693072118.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/baragokeretanenovomaboro.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/34643510378.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/54771815560.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160747f7bb4e7d---dedelanal.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9sfsuv9g3e1g8tm4j30ad7j8mn/75884258600.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e2e6939fcd0afd8d2f06f325cc689ed4/4252100593.pdfIn PDF document text
    • http://mav-auto.ru/images/file/goxadojatifawepikasasit.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/36900237167.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716ea4f13a0---91417815907.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/28524420737.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6eea049cf---jexafeminazima.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d41f6a0e1---xarudolewezekalokuw.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/kenakewiwekefazotux.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/kutosozanibaxikuji.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/11017921858.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vibip.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4559878061.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/35981622263.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768c623d95d---83746896136.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tatabuvew.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_off0000c6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 10500 bytes
SHA-256: 2538b6aa9d587803194296bf24067d8895247eeccdd09823a395f7e20cee752a
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 15988 bytes
SHA-256: d1ddda9e914b6614d2f1e4dbe9c43583df07a0bf776e4678afb7295a28bedd39
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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