Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bf181f27213d87…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 20:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a92f38d7bbc84262cf7e8ae3da706290 SHA-1: 03b27b6180750d7b2fdce0ae8dd0aa7d00b85e73 SHA-256: c4bf181f27213d87a816cb23750f200d22e75b84e969b828510fc03304965f34
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farms strongly supports a phishing or credential harvesting attack pattern.

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=you+are+adored PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d24ee801---80240293784.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/porevukori.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/21204998662.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/50m829tn87u4pmu3vd102o8n65/13229814637.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c48fa7ea2fc---84973310450.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/39978844552.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778bb70dbac---gajite.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/lenidabomijibewujuv.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/panozowadigupuwalowerumi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/194ad7bbf8935620cd7f1b01ed243a4e/xubumivuwezapole.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9f058b08cc4f7554c124b132e2a67c36/55142742384.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16093c87938a4a---jubebefejikutijejofa.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/1824606615.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfbeed3776eb3a62096b2f96c4a0c055/53158820546.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/53655247893.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d933dca26c---fanod.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ba510ca0448be2f06ffde581db138937/58492558486.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a88a27c3f---teziwumuvazajusabu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/38524877064.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e907d46e---84575606877.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zoferekeledog.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/24188402214.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/85030768851.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/af93b7b7039621c7716bbd50f7b40f7e/77429879329.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190e323f8f---lorofaxijosug.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17280 bytes
SHA-256: ffaee121ee74aab0cff1e2ee78c5a72c6aa314a05506bdf0b0e1cd4fb0f73b00
font_01_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 9816 bytes
SHA-256: 2eb96066efe27e2d26b3f7a15a928b26fb52c5f5706aab875cf6e78ee9eacc2d

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