Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d716bc3962201c…

MALICIOUS

PDF

90.8 KB Created: 2021-09-06 05:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3eab4ae4ae6cff302c3f50f6fd453e46 SHA-1: 5aaf6ae63bc18d5aceb63bcd5290a9fb8e46aa9b SHA-256: 53d716bc3962201ca86b55414175d63a9eb2a5b275d9c70daa5b17f99a11ee2f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to potentially harmful websites, possibly for phishing or malware distribution.

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://kelkenaghshband.com/app/webroot/img/files/mutolerokexosufajuj.pdf In PDF document text
    • https://okud-istra.hr/userfiles/file/savolowulubo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fevaxowetuvogodozatatu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/83616715733.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825c47c0ddf---kivajogemedikosapavaw.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/41699982982.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/43280602640.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccf086bdf---wadenokipuvikolemunaj.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0e3add0c---gokavidugagim.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/cb22a922ce18590b5876e21d514fdbd9/63695411555.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e57e3b4c0be---3243113051.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/45005775504.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210813135356.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/69593710520.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607298bfccb8d---83659434360.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/37955028187.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc25e77d2---62427487264.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607167f2607bb---74019224543.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d0113b2116f76df6a2f8078bffa6a92a/lawepasusiseb.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b561c3a9473---relaregelajaviribanaw.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fadibevutagokete.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210518012349.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105191608.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/36187977158.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/67024996266.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ed297a2cd878652738412747ab854751/72968969895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nationalist+historiography+in+africa+pdfPDF 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_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 10860 bytes
SHA-256: 5558d5c9bfb1ba29717717b1f41cf22d1cc632d5ae9a0c15fc1c018b417f3b5b
font_02_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 18852 bytes
SHA-256: 7ec6c432ec1fcf7e473aaca507b0a9146c5a015b754bcfcbb6632b920400c15f

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