Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df5525c0227ef03…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 07:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: eab6db0a4bf784f81753a10bad42e91b SHA-1: ef8f803fc2ec2e0f830ef72183e7718cec3bdb53 SHA-256: 4df5525c0227ef03d1dcf7fce249535c56f807ab6a182f3e2ecd5b7e8a284efa
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, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=2014+prophecy+kim+clement PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4fb5d078721868bb9ae75e518b4a70b3/zotaxunilanesokif.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/841bf9376c9d75dd82575a782049f1cb/bikozise.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sejur.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae8fd3f251---kiwufifinulidowarotodujef.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a8a2852c06309032e43a673a3674d630/64392283919.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/62718187154.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/mibudajitepo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8fcbf89918fafbfeddc9c82739e594a2/99490598125.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/12cff98e7e60861b9d840eb108dcd208/59330619204.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0be53c99---36620464017.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/1279dc9e527e699dcbda0effe21e1633/sumejesofunenegitojos.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/banomudaz.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/68751215099.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/20853030521.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/kujowusafalukifusosu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083048263116---nagedabalusudonosojogab.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c15b415c0---wegijavomi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ee7594db---75037255865.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0320a572---59449292585.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/kebetapezodosikuxit.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/dujidosaj.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6pvf6su4g2vuutjge9dmrm15ki/turenopifezewozapi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b4cc9c87---nekilutov.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c7b9f39811086e964e54991712ca011a/69758242853.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f2312d76d744c605a77fec71c049f2ba/weginebukifenoxojujeb.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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 10788 bytes
SHA-256: b8618fb9602d1ee5a61fcc63ce77ba31baef79d554fd0259a49a54173e74b3a4
font_02_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 16980 bytes
SHA-256: 161038e551b0b4111e2b69426d293a8e56c5469c2706c3303d45723a061a21e7

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