Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d9ac66a26b2f45…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 08:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c3d2abca28785c5ccb1db3425a8b38 SHA-1: a8b8fafd5037d774ba2fa5ce23d27c5c3aa65ac3 SHA-256: c4d9ac66a26b2f4594b455fc4aa99e981643a381e95f6dc21df2abae00786284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or host further malicious content. Heuristics indicate the PDF is a link farm on disposable hosting and also points to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=jinde+meriye+full+movie+123movies PDF link annotation
    • http://pusheng168.com/uploadfiles/20210904042034.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/bunanimerigudisovu.pdfIn PDF document text
    • http://briztravel.com/upload/files/95507671432.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/30693534014.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/71018372057.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/dofawomip.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/tepajusidulamelunura.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/repalabobitafewiwilut.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mixik.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03751fbc3---57118401663.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dad0cbb2---momibuvererinu.pdfIn PDF document text
    • http://vhshf.de/File/buvefezipopajow.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/vumoripujonurutonimem.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f04a5908225d3a5dbe67941058b4358e/fobebogisedu.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/56032924909.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zejora.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bonixaluwamonudu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/38082163940.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/90541260823.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_124412.pdfIn PDF document text
    • https://kar360.com/resimler/files/tunoriponipamado.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/13300954953.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 20196 bytes
SHA-256: 678f448c533a1cbbdbce69fd148917838f026ad73316820758c7c1eb9f2981f5
font_01_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 10868 bytes
SHA-256: 7acc3e6b3a17a86befec1881d255df0624ae69bfeceafff723f78571cdac3639
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1