Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff59890d8e1c828…

MALICIOUS

PDF

81.6 KB Created: 2021-08-15 16:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e29397eac6abca9f9f25addec51675a SHA-1: 9afd1865346f07e2cd673ea7ad2be942c83df61b SHA-256: aff59890d8e1c828e4f18718ca4c53c7e07538dfd7c7f02ccb6b6f1165895914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as confirmed by ML classification and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=does+toads+eat+grasshoppers PDF link annotation
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/93087481984.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u9bs2terrejbq1pugo6mfcebf9/zajedinolejoz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1a2bbb10---60196485445.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82378744e---94303552796.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jumitevefuk.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/gelena.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/rapuruwumaviwotasava.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b8e0f19071a1da398ebc49ea8d2d01bd/leziwan.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085063e019ed---tugazabozol.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/medutosusasajokixo.pdfIn PDF document text
    • http://minerva-collection.net/files/files/87527654809.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2010a0e7cb---geragofo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/1242687471.pdfIn PDF document text
    • https://designclarf.it/file/90603225230.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/54701975793.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lskklncp2oua8gie24uptpufgk/gujam.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/58387f8065495265ef0dd70324e8c0fa/sowafamevavi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3ec59188---vesisumag.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/wagegunibegagemezoriwip.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgg4ugqk4hfus1opmcntf7kc4f/43096013148.pdfIn PDF document text
    • http://coumert.com/images/file/zodetabitorovunufaveveva.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/14506717590.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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10428 bytes
SHA-256: 0d40adede06a447e492abadb044158f285ef75b607c0047cf5e2da5d519d9cb9
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 16540 bytes
SHA-256: 06c6429dd620984101210aec69dcd8c9585d9a837584e32d2787ce354e0a504e
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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