Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6f97ece394db9e…

MALICIOUS

PDF

123.5 KB Created: 2021-08-14 17:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9c98bf9d2dbb0a98b47bceb06162b6f7 SHA-1: d08462d2ccd5080181fef54dc10cf049b55538be SHA-256: 9a6f97ece394db9e4951d05f11e6cbe528e96a311af3aa0dd6dadd81043b6f3b
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 0.9802

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://drafthe.ru/uplcv?utm_term=pak+studies+class+9+book+pdf+english+medium+notes PDF link annotation
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/e92pub6rol3huul3061kbtu2rn/pevenavunupetinolesared.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105090649506945670jw630.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/liromifefexuju.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/paai5ju4kqpucnti2ch764vfc3/lubaxivogudigo.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/bevujufipedufenukujimap.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/batirifexokisedoputobegek.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b69a7cdab---8345821383.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/2174484748.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/regerosakibi.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/dowugakikidi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b1faa3da1---71257412138.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c526ec45a53d0fb7dd4c5aba0b990157/nadijobuzudirifijoja.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/40896965274.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/39925674263.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec93e2988---lekaxewap.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/durizowukezebidot.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tuxetenu.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/patozasomipuj.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/th2li9sa9q1a5ter0j3co4f3af/bevuvejikisigun.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d21452456bc---54234328466.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210603083802.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/jizejo.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/75959494734.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210728075134_k0gz6v.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17433 18664 bytes
SHA-256: b0a2a7be9f5efb66bea77d1911e67a63df03829421a5e4cbfbd2a8c8f4262c46
font_02_sfnt_off000191e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E9 18736 bytes
SHA-256: caa30ddb47a536d0954b16287904ab70cc7eebdb425490743d54fabc285475c7
font_03_sfnt_off0001c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C376 11468 bytes
SHA-256: c5cde6e0dbebaad121e1f556746cc782d92329830b0495726e19a1f83835ffc0

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