Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65c3ad9819cc952…

MALICIOUS

PDF

92.0 KB Created: 2021-07-05 07:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ae1f5457d1d621c99e223463f22a6151 SHA-1: e1db7fff8dcb354d28d6f8b6312de3203a286096 SHA-256: f65c3ad9819cc952242e1f9ff8561612a4e85c11f82a596d87b2d3036a8bb588
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads or phishing pages. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in phishing and malware delivery. No scripts were extracted, but the presence of numerous external links suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35589ee74e9136c7dd6ca019e036a66/12017441980.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b17917ca5---41046000979.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e197841b6---99074957708.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f06b113bc---rosepusuvekapozivukadurow.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bb05f025---72327142395.pdfIn PDF document text
    • https://scriptdd.com/_file/file/kivosodatabagatimaw.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vfnl3sj1mrc64snn2pk9n48r4u/xabokezojezavafaju.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/lizenomewipuwolimowuj.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975c79a81d---2082021732.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb5650af6---42350897898.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7314da80ef---lofijekikulawenofefak.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834b15420d2---17091456380.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4705473a22fc4411f5ebd68fd65986d7/xugiwajikebero.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/wavirewase.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed2607187---wodukibivup.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/5507056899.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc09210dc8---nubarosavutoxol.pdfIn PDF document text
    • http://yilip.net/userData/board/file/58721159118.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/48778810027.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b547bc6f---bunewoxulekabemolepugaf.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/48dcc294e6eef18d968606f7eb940256/56364865764.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/kosirafetetut.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/betetijevowo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/81925300090a5288f7a5b785ced9741f/25658489262.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/23199603005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mx+player+apk+without+adsPDF 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_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 18052 bytes
SHA-256: c2377a118660acce8dcb937c8cc5cef80f27ba2057e8e6ebabfbeade61414391
font_01_sfnt_off00012fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC9 10872 bytes
SHA-256: cadbabad5dba40507acd3dba174728c5ce999f8192da2879a9ac26e55f763365
font_02_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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