Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d7ce74414b51e6…

MALICIOUS

PDF

123.6 KB Created: 2021-07-04 15:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3a4e7d25141249b2128b6ae19c6e4b9 SHA-1: 0a1ac742e54fe4e58610ac3f5b29ab1a818e3d9d SHA-256: 21d7ce74414b51e6c404fc4f0743b700a28bf95390cd61b9923699af40ce0369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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://ketchas.ru/uplcv?utm_term=19000+kb+to+mb PDF link annotation
    • https://pfhotel.gr/ckfinder/userfiles/files/nitutuxoregan.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ttcc15t0fosnos2s9nhm0h77fp/34385448267.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e0e169317434935f13f69057addc06ee/pajanulut.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7908cdb574---genaxurov.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/dinixopelekal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/465ae1937851fc20f64ba99e5b126f48/33244982646.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/76860083050.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mazeripowabunazokara.pdfIn PDF document text
    • http://asustainable.com/global/file/famitusategonejod.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210524045825730.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/1687586175.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5c1d522157601a3d422b7968ff15d7c8/modawasofepetabixisiwibeg.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/sikuwazirelapuloli.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bf7e819e9b4887edfbd6809facd64ce4/33941213159.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d3sqo7v6f2cri4jdksurseggt0/xafirumajel.pdfIn PDF document text
    • http://beta-rc.com/upload/files/20805785402.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d823c44a4bc---52063235982.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/54762022254.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd8e59994---mamozepumowozuxakixud.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/davepukeve.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b918aaeb---54132047219.pdfIn PDF document text
    • https://corghialberti.it/file/94262649955.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 29316 bytes
SHA-256: 5fb6c017147c251665e42b007a1f4f344d706c3371093f9b0ba631fd303b8d53
font_03_sfnt_off0001964f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1964F 9944 bytes
SHA-256: 9794ed2e4dcb7f0d3b773663e94936d4f1dfc18ba720115ed7511aa46ac61122
font_04_sfnt_off0001ac4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC4A 19096 bytes
SHA-256: 1a2675a12f76ed5bc896ef2f2d9cf3deee8c09424f8f785ada35dae7ef794f4a

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