Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da94693306ceb38…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 19:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99fb5ae310ee7a22c717f04899c18dd6 SHA-1: 06de48c34de7e0dbe6522ad61d09bbad386c1bb6 SHA-256: 4da94693306ceb388e8963149d761400f22f8ee58a5fd0703cd0cbf3d606b780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver secondary payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+to+move+pics+from+phone+to+sd+card PDF link annotation
    • https://matfreklam.com/calisma2/files/uploads/jejagubavusaloju.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/91128927526.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040649077087.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a0f6aa85015afcd6a8d822484dae08e0/73035696197.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gotelubusiposa.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/rijutopuletipakufabizaxil.pdfIn PDF document text
    • http://timebymtm.com/upload/files/resemawibadagoged.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/kozugerugategenifima.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/nelusexegile.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/bewexerijesutixojurowokar.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210919100040.pdfIn PDF document text
    • https://comfort8889.com/upload/files/pugawejepekixebokaxu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/7417734126.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/fababajawuxupexuxojezokex.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/segedufejimutu.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/62148647967.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/48909000594.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/lajezafosuritudowi.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/teluxogavid.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/67245199222.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161379c8d6bac3---77392696852.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/jexojodosif.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2090ecf15---tuloguwizakaranuwipaleka.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jojepitimorelajinigeduno.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210913173315.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 19032 bytes
SHA-256: ea22dd8a0da42efa1ce4b14a0448e89ff4e8ef0a0399fe74322d1e18d5e72568
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 10980 bytes
SHA-256: b585f78bbc4b69da6f8449705a1fc39ccacaaef0346cf8725010d1bdc454d091
font_02_sfnt_off00012baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1