Malicious PDF — malware analysis report

Static analysis result for SHA-256 81afd30f7c5feab0…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 17:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31f5b6e351ca060905c61293f83ac0f6 SHA-1: 08241b6216b186eed29d4b437bae125b18109bf1 SHA-256: 81afd30f7c5feab0d2e0095e1430b35a8554a68b7a1a3fbf47877b043915b0b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious or phishing content, leveraging the PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/nolaloxifemojogeguxi.pdf
    • https://diaochue.vn/userfiles/file/zavupajigomakugilufas.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9750a3e2dc359067b1401843dcf68567/mimekopitufidoga.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b4c4b3ed2---nezoj.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32c0e393f---50700547281.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9mc7b77i4vhvb5pkud7bp0s4ud/39722217203.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0c10c71de2331f8ac945e32673adf828/latak.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076227b5c8a4---49206228903.pdf
    • http://amirafouad.com/uploaded_files/file/sabixijajuxobateme.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3dfacabe3d844c3ff94e15063a8aa47d/72346196048.pdf
    • https://avela.md/userfiles/file/4118456792.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/653d02e718868e9c9c0668429b8bea34/zidoxojadizudulumax.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/35db9d1038275bbce786981252d2f5fc/towatijajabilokolujagefe.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/99779513545.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858b5519611---93063368599.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ee8eaf5b21b5ab435e8487e8315ebc25/44018757283.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160857d49a57b2---30717771836.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e90ba37c1---mikeragojekunosim.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/125e128d0ff65b19a95683998725b854/nulabejekimut.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92fb14d83---toxulovebifujabes.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/stg5ks0dmc1tj2aus1j36ps934/fututodet.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861a2636db---20996612941.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437a5ede23---23465357637.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a8d76f8d---12983234632.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f8cfdd28e1855e45cfc37302e8c2eb65/luxafujeziluzisokerefimo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rolex+submariner+owners+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f847.bin
9eeedee14fc454963ed94f9183eec4579eec72ba278d19b421d060aa078e6217
pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10644 bytes
font_01_sfnt_off000110ac.bin
41e167f240ac25ed9ad67b51234fa0f2b1e290146c329ca25c90c4412d59a121
pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 14984 bytes
font_02_sfnt_off000136df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DF 16792 bytes