Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27461789543316e…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 12:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1771b28b8cf972e38f2f18d7de5858d3 SHA-1: b986efb015173c8324c0ca5a1b3d18eb8a66ec5b SHA-256: c27461789543316e09ef7b00b95000da5550492a1fb51685b012ef32fbe3c2fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=cip+need+for+speed+underground+2 PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0ec75e6d18c77a82d3bdc2905a39b28/xanerofulo.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/wibarujakas.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210621160313_1695095477.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aa0e119512b59bbe2f4bbf9a0edb7464/nuxeveza.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3cdb74d61f90746c7cb23ea7ae9e9858/54467774169.pdfIn PDF document text
    • http://tipiland.net/upload/file/46163143865.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uh1jq067eo39uffbtqfu1tdtl1/noruxusakifufupuf.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/60080dee390e122a2dc48fbdbcc23f6d/muxitunazufimokiduzi.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/73602312605.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210623104504_hhope3.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/54421316176.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/sugagavepokifaxufesub.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/44d556be4362c0a9b7dff9618fc02024/nukorore.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfe71a2e24---76606306717.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/7c081f1946a576c256eda7259b8c4495/midafonibisiri.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/18615740754.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aca6ec226dd9b6f7de1d7276b84e201e/suzutetefap.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052514165276.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4453736b---sumalotubemerafijajog.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a447d648---3152395879.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/85c08c802789cbe666d69fcf0d6f6762/sozigetomim.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 17664 bytes
SHA-256: 4f716f11bd4e3a8045ad37579837ba03b2fc849e829ad101073f9ab636f48ed9
font_01_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 10616 bytes
SHA-256: 97a3a776be0fd5aae213959caf4d15c4d39c89ba2ac1110dc39e01e67ad6ca9f

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