Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc32b40112ae2e25…

MALICIOUS

PDF

98.7 KB Created: 2021-07-28 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0927e9153d20916ef3858c5dd385080 SHA-1: e66ba4a10109ad58d0f0c850080f1c391ad9b49c SHA-256: cc32b40112ae2e25f413a7491b120b16bf5bfea98d0148c5d9a963d4bfafc966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5ca53f555d842a86ff1cc413b81f38fb/bizutezefite.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafed6bac1---12725164517.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609860944c730---rarosubu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/37861043877.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nbisvf8sd805jnubv5f14al9jp/xaroxaxorumuwuzatawo.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/fegixazinaxogud.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22983658317.pdfIn PDF document text
    • https://people11people.com/uploads/File/21607398447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55c432df63---54178997630.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1dd055e1a665643f033ad5fd62ba385a/vobuja.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c656878207---viramagufejus.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a4d200f7---zawoxugibadipidonexevef.pdfIn PDF document text
    • https://jurad.eu/files/file/36980542320.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xopagaguropalebevudixudas.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/92621934841.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6lmnm3s9mhlkotci8hhud6ffm5/19693756366.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/63417322758.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/pavesuwixuralitonin.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3a4a1371a49d5fa6ac1bc110ae05ef5a/31995008616.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160727b54ad02d---1684621606.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f217e6d18f---rixobovivakar.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/49250159429.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfbdf1e2c45---kisowiwugobinil.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609524fdc8af8---sobewimopodinezugokezovi.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/nanuzisizajobabuti.pdfIn PDF document text
    • http://lucann.com/Upload/file/49940866142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kailash+satyarthi+interview+questions+and+answersPDF link annotation
    • 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_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 17792 bytes
SHA-256: fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
font_01_sfnt_off00014a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16269 10848 bytes
SHA-256: 90695f369485cf851ff54e7e800de84ba9431b3ba2801eb799ba462e157fa0af

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