Malicious PDF — malware analysis report

Static analysis result for SHA-256 55492be4f7f478b0…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 03:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8f7f7b99b337aea33d79e55bc5185581 SHA-1: c78f7b27cf4c44bf45e7e1ef80c0aa8cc518e49e SHA-256: 55492be4f7f478b02ff4487ac4dc4af994889e09a0e84e1d3219eaf2cae1dc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ec43f224---90691432847.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fcie2hs48e8b5hlb4ctiso78vn/55222050379.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/l9a2dkqfuab8jobjjm2j3orqnr/63083183921.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/73731433813.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sitasobikowaserudo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/piluwurevixivileterad.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/db8113593f2843696f636cbceba16b3c/64564563178.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c34bf0c8916---71136210840.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/kasoli.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/765c50bee5be125794d98292a7ff73cd/17294091107.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fe5bsbqaoneeh0qfd9m8443s8i/38616747875.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/jivekuzuf.pdfIn PDF document text
    • https://epiphanych.com/images/file/sutolefakixok.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/kokukipobamer.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9gkq75b6i3srugivni4kjj5vm2/panipukogidudepifisepib.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/34451366013.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/91768222358.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pixejiwa.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/73168768805.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5565cb88f5e88ec97d6813afee193f23/wadupubugopujojixuv.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ubu3v1o758umom8kksnj58j50/libulinojisofug.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/da902c50d44f7d82c54e14cf88147159/ronodobezi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89b778bf6---26344944205.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5k6p089lra9c740ns63bvbmkv9/wolopul.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4af408d1bbe278eafcc66f373d5ba747/rurefejewugetovubovuteman.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607c644133655---28460580953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=airpods+2+instructionsPDF 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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10368 bytes
SHA-256: d811243471bca6dfdbde4579f6528aac98f6e951a037c2e1906014b028b2f3f9
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 17004 bytes
SHA-256: 070003734c9cb0255a4925de5f8457fb240f0e01e94cba715d73ffcf5aa90970