Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c474f4b8b4b5b8c…

MALICIOUS

PDF

90.8 KB Created: 2021-08-07 03:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ae6d16e06bb100581c6546dc490007e SHA-1: 8a49e670367758c20c2f2bbb6d3f41b0ff88a979 SHA-256: 2c474f4b8b4b5b8c0fd8392ae5ff4baa6522625561a590c4b90a67ee7aedefd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://cructi.ru/uplcv?utm_term=how+do+i+connect+my+netgear+wifi+extender+ex2700 PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/911632c3cdd8f6db7a30f11e0e3f3937/tomulikuwiwifejidobomeb.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1346a57848699441a0cee4bb2d8742b8/14225798456.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/89985869647.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/71958606150.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50e30938f---janixozasezoxizizefadava.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b35671a74---78561191258.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/89096846839.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/fekubevilufigolige.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/15815888540.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/rekezuzukawominoru.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39f74d660---xebeberibapevu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xolepozerubijezove.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4vu0uo8or8uruh2hvldvb688cc/bogoxakez.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/rewatusijepojebivokama.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2d5cd408e2844a074d0018dadbf3443/buginisajibetit.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/36000576853.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210806_212028.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcf2eb2198---lafiwugobose.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4938723c3ff0cbf8e4195b3160ae7240/rirexosi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9cbbb5d8d---56617935100.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bae293ea0159f0ad8f692721010a5030/36030053644.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7sn68v1i4msqkc34ka3nsrcui0/gezebamudugekoresuzalo.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/nakusu.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 11188 bytes
SHA-256: 4c25dee0c3d080745271cd607848ce0a46ff7c1f6a94041646f7beb6d5196e4b
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 18692 bytes
SHA-256: 1079e694d5fb20da61d9f1312dcf3e4ad2f1736f0843532be293136a689f09b6

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