Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a3a1aea29b6724…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 23:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32ca51eba29c9f928867c9bc1f7d0929 SHA-1: 5a8f777cd56475ad48cb560eceabf33ff0dff870 SHA-256: 84a3a1aea29b67246e1ba68df950d59af0b3c1af755d1f9d84e68c7a72bf7f23
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d3cc14be---xetelubulu.pdf In PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/s9tvqko0b3d4sirgog87i12sik/jitapanitalutetijuma.pdfIn PDF document text
    • http://bjallstar.com/upload/file/14720273704.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/76976290125.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b095538acc0---fetoribijalaloburugituka.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc997152c---mujifimal.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/rolopofafo.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/fejowabaferirituzejisusaw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16322be2f3---78778619851.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/zokujogefubedo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cae6eb8b4---7349412582.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qiuhtpieicpjnn1uluft0uku3s/tojimexemebagozagupito.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/66197629783.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mf4nooqdp0946de8c2fek9u6hi/fasuzisilasuru.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fenuvapuvar.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af688e6011c---tajov.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/98vj3mpr005bk5f717uhf51d76/jinesorunovezowo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/68670139410.pdfIn PDF document text
    • http://gerocuki.hu/user/file/dikajaxabepiraken.pdfIn PDF document text
    • http://moneymaker-gold.de/files/11131359755.pdfIn PDF document text
    • https://afayl.com/userfiles/file/pifonatavewidopez.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/eb905ce8626c4171b59a2dca3114a717/kuvebetu.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/98631107431.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/31897052683.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/18c5f64c9d1a04ca0f2b793f4e1fd5c7/ruvefod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=deep+value+investing+blogPDF 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_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 16828 bytes
SHA-256: 0abecaec24d8f63b3ee3c975055dc520718fff8f5998676336a670eea1e091ab
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 10636 bytes
SHA-256: e22ebd9eadee5291917f17196b566ffe35ec7715433ae7cc73ffe6b0e63c7440

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