Malicious PDF — malware analysis report

Static analysis result for SHA-256 0162d07d7075a070…

MALICIOUS

PDF

92.5 KB Created: 2021-06-13 14:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1a4f55b7efe083606892aa9119dbb42a SHA-1: 64ace5ff693221917d770d99eef9564b88ea4fb6 SHA-256: 0162d07d7075a070d808a93edc04b29db636dd4f053fcf51ba86d7e4c3357d96
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=12th+maths+book+volume+1 PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8b542bd0cd727ed5529cbc1e068fefca/gugovunosap.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c6c37eb1---bifetunobefedo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/k5qrpgac0cqelpatihdfpo85l8/72925077655.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea8dcd3b0---dufelatavegoson.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ddd46ecadcc89af3e9a25ffc1bf0103b/fekadugoli.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/51246efbdec3ca9a6e1dfe3648124d71/17721333154.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b952ac18678---21827256315.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c3d322aa---38044974612.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/gefevofigexa.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/95322440643.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e275a21b6---9182102018.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/lagegiteperawafitijubazed.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/14abe8dbb0e78b7bf693b93c3de412ba/31476358230.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h5ks82h7s0rmi77n79qg7p76v0/34165210895.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/5408761250.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f682.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF682 14264 bytes
SHA-256: db5f36b487ace9e746337a79ca5f2130b6512006488817416c684901d20f34d0
font_00_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 4912 bytes
SHA-256: 23cc770e0a4578c6a38acdb46500b2db71f4c6cf6b5f5d1493978f60816dad76
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 11144 bytes
SHA-256: 23a671e432375185d384161a92821afcbd2434d9fc18d9dafa9f587aeeb726c4
font_03_sfnt_off0001409f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409F 16204 bytes
SHA-256: 3c260b720ba846d87de456033c05b94d326aa9f09b16dabc19f167f97f6ae321
font_04_sfnt_off000155cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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