Malicious PDF — malware analysis report

Static analysis result for SHA-256 8babd68f164d21db…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 05:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b89220a439af351c4b2872fe3dbeb62 SHA-1: 6ed0addb8241bbbedd44fda211cc7b13e4a0e325 SHA-256: 8babd68f164d21db4888a04b53a12983c8508eefba293a852e187f104a4aa074
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content, potentially exploiting vulnerabilities in the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849acd019c5---xagemitem.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5275198ab6a778de4c22932466d5b6ed/dazafonijurilebojixo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c61627b5019---memugazogofozukekote.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/84539965054.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/toxos.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/mevezewolomodepe.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/64152938251.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafdb841ec---23925906303.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3c8441459f4f6cf61043d49fc9f74e8/vilofiwe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af26bb3aa---gezun.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c5472a09542fc8cb1915c8f203c7650e/6540575939.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611c837ba1141---mixukumolede.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/2030780311.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/eb083d1a6e35495bbea01ecfac86cb93/70452927043.pdfIn PDF document text
    • http://ud2-140.com/files/nakibobukez.pdfIn PDF document text
    • http://superpart.com/files/rukogipazegoxax.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4e832d5f4774f952a0757646bbcccad0/64216469648.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/fugexokete.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084575215cb4---17107082547.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8971db0c666cadfd11e00809775fd1e0/pasijasopezojox.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/luwinejutamalaganatosuso.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/04c91879c1f5e78430612dc860ddfb3d/niwakunamovudigurafuv.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103c93791fd6---46127057438.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609161d92fd5d---mabiwibumewodo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/2481091259.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/da996e4medd4804jbgpu7gr506/pezikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=texas+principles+of+real+estate+part+1+practice+testPDF 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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 18980 bytes
SHA-256: 19defd647efd02e7b2d9c7a8783975b2e45ad551bad30fb1b01a63aa57d263e4
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 10588 bytes
SHA-256: c9b4401c8de59d80f30c6d4fa3b553800ecf9713bee9eb3c5b47e229fb23d65e