Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe79ee54018a79c…

MALICIOUS

PDF

115.9 KB Created: 2021-09-04 04:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 729672462b4e5449f8f42df7726d69d0 SHA-1: 3f14d6908cdd62a91cbe64f1a9a343c8e744fb57 SHA-256: efe79ee54018a79cb51c97ac85869d8574b17dde97ee34448e3202cffc0f1efb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and heuristics suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6s1s0qsa6ahjr0pomm0lsf0h5n/gifetexexojubukogulipo.pdf In PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/revatula.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/54163808310.pdfIn PDF document text
    • http://ozmutludokum.com/userfiles/file/zawasowire.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/derego.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/18007559089.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mugikifizobarivotepet.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/80674035316.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/530e970d685026f9bb5a271c21bfec94/8083004090.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d35ec08d3c9---nimorosidilewonat.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/167ee4167b14781fc5bf768851c2e36b/183904693.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/32836120299.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609897b1cec4a---8127348888.pdfIn PDF document text
    • https://medpressa.ru/files/file/wuboriwu.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/pirufijevefegejawikadoti.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/aru8fpdvis43g8moln40i8u1e9/11798241791.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/78fc4500017001a18797ed8c1169bd5f/nusisodolovetix.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/juzuroxaragizoliwuvifod.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/datop.pdfIn PDF document text
    • https://computerzone.pk/file/49080086603.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210618183125.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ea858f097af017c34f3eb2952fd88837/petalupamifemeget.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/65223297166.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f45d8af5f252861c3e64398afa86d467/zavinetilafanemopala.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a636ba895---zizogapulonisumesonisebo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1891a13332d690fe06d41d40b4b9ffd6/61114643556.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fubosapuvegojavopibazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+de+excel+avanzado+2010+en+espa%C3%B1ol+gratis+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_off000152e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E0 21564 bytes
SHA-256: eb52fbf67bf7d48217c10a6c87b396ec4bc44e9ae68ab2e65333b0ed8eb74647
font_01_sfnt_off00018b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35B 11616 bytes
SHA-256: afdc90a1967c590360a55dc949eb1e9a7d90f30e0a99dc36fd0b89a94c869246

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