Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d7254774166004…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef7528b8409ec2e5033aebe40467a81a SHA-1: 6fa96e63f2fcbb48060bbd4c0ae815a81b0e50d7 SHA-256: c3d725477416600447779840f005757a88a0e66592a7fe5ffb5527b53ba92a3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external PDF files, many hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URLs are indicative of a malicious PDF designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inprovit.com/ckfinder/userfiles/files/10038368724.pdf In PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/gevadipenafonawowed.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16152e5a69b371---48213589012.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210912_3D02256A928D94FB.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wuduwisazivesiveruweku.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/70877310513.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/96271120363.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/depudaxabidiv.pdfIn PDF document text
    • http://baove24h.org/upload/files/27992559316.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/sijogaramamoto.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/51903780701.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jolojolosugopub.pdfIn PDF document text
    • http://megalaserasia.com/upload///kateduxodawonaf.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/54178307052.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/76000098637.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/vunutomafudogonoretivijox.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/rusenefofajuf.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0da4bbc9094372ae9afaa79b81e6e746/76299909267.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152cc4b2f091---1862197775.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/71134782800.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/29875501809.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210928095712.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/tofezu.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/18994991320.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/butelezefutuzivobakuzize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=playspot+make+money+playing+games+apkPDF 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_off0000b2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BF 16768 bytes
SHA-256: 5df04d7fd1ae300328a462077af1ca353f6825cf80e6566549ac593ad1adb024
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 10704 bytes
SHA-256: 0baa1d85ced16a85971ad1d3ea59f8d05d3c4cba0d5e8e7e1fabbf7048b7627e
font_02_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1