Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8782a7f8fca0e6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 22:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40c9497d25bf2eb12ddbc981155073ec SHA-1: cbd92d6417d4bf6396dd129f76f87bff01c48ecf SHA-256: 0e8782a7f8fca0e6ae31b3cc4d5a125457703eb0d1d0f8b36376294cd96ca361
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic findings of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further support this, as they highlight the use of disposable or compromised hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=drift+masters+unblocked PDF link annotation
    • http://hainescentreasia.com/images/file/kivuporelexa.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c128ae455---43998966307.pdfIn PDF document text
    • http://offerparts.com/upload/files/94764796183.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/24111344631.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/18486553948.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lilejenim.pdfIn PDF document text
    • http://futboltotal.net/images/files/62682801022.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/pumilufapugavasitow.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72376295803.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/41994463216.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65306516e---tamakux.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631485103.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tizovizesujirigusavave.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/9598420468.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4944c40d5a5c97146fa728b484a9757a/82160015669.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130b128f1c32---wepilapimi.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/jefonox.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/86728357035.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/33975876241.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/sjgrlt3momgghpp6k6779msls0/lulumefiwetaxasigunoju.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugidipibimodaxuxopug.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/losusuragawanuvex.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021921051533624.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/masisasirupefumumupo.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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 16876 bytes
SHA-256: ed023a4f6122e69e2a9efb92852d9cfcf97dd62782e0490d2100ca59873e7afe
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 10968 bytes
SHA-256: cdf9f56d6ccd66355ffc1287793495cf7aaa356f32eea2e38de23e67b92c4ecb

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