Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b216eeb26b9dc4…

MALICIOUS

PDF

109.5 KB Created: 2021-06-27 18:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cb54f4ae32f4b5b6489a66c0a1d37c81 SHA-1: d6e0b8f104c52a392b88964884b57bef06fbb035 SHA-256: 37b216eeb26b9dc4fbb9e16f0ed55465fb24409e04b8cd7bd78efc712dd5a78f
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 high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other disposable domains. The primary attack pattern observed is the use of these links to lure victims to potentially malicious content, consistent with phishing or malware distribution campaigns. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://queure.ru/uplcv?utm_term=difference+between+polyphonic+and+homophonic PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8e161bc5c858dfe3c83589578ba26032/narinizuxoxotoleres.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/92023417840fce10dd61382cea723487/96371331403.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/3001ff2118742f66343cdd65e077edc5/kidopojudulonarokaba.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/voketuj.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/64feb3b7a15874c6e70340dc8c656e57/36586185863.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/deae0a2e3ae0594d63b74d4bbd527f1a/zuwad.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/78900581706.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8ee10de6adb2ac2eaa7b71c9959bd410/3656719063.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/47421269681.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b14030c21---wusuzolizinusewe.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/ravoxepedun.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/92272184196.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/28d636a8117e7f7656ca18994ab20f6b/xalubefugapuwigej.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/puzajitomefigimari.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f7f37cec---zulezizitezelarin.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bdc8e61b9be013e0e53344eed053f2b7/sebiwakudilapumibis.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c1386057---11463216072.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gekewufadoxos.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ea3a2629159973c3c2d9278f2fbba8b9/mitimun.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n81sus12ntn5h6ct0mt81k8k2e/1567495341.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/tuloroludupaso.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/93ae95f1a2924c2e3866d2e0253327f7/8851623815.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/90246677444.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c9f168c015f8985ea42b2b5d8aa2a504/29549821712.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b5c54abbed69f5dfb07e48b22636c70e/naxuni.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/df7dc41b143335c495d9ab49b25fffc1/352458354.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_off000146ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 11060 bytes
SHA-256: 336ede008b696be19cdfa89507f7c8d05ba00ee290791f00b840f5bc6de38335
font_01_sfnt_off00016013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17825 18796 bytes
SHA-256: cd87190767f3d387190dde4a17fac4f72dc826a6177b96fc285e0b85cd72e41a