Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd9d36f69642b55…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 20:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05a1324aa1733346fb5a20c48a2bb60e SHA-1: 3d0a946ae105788601537d6330e013e28617de61 SHA-256: bfd9d36f69642b551a1b31cb79ca95715005bfd8480a75749ab8b1453a8ee52f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan indicate a malicious intent to redirect users to harmful sites.

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://infrive.ru/uplcv?utm_term=present+perfect+simple+and+progressive+pdf PDF link annotation
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/62605786814.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/q8tbq21dcmhpa8nlubke6qfef8/diwulekawuvupop.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/memivofokameb.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/67520179948.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/lazanedimezolusotugesu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bogazawowosinin.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/82866548978.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca3c9cd151dd31f769f3ed3488dd607b/14496283887.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/fatuzi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/69759520299.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/83627254181.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d964d717c---69434581296.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/72929693267.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/bikuvopagito.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/gegexezetudu.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/82154622338.pdfIn PDF document text
    • http://ativn.com/upload/file/mapewokuxobinininixurigig.pdfIn PDF document text
    • http://4bx.pl/public/file/55381785922.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/rorowenukimipuferonuvune.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca19ecf00---68430902815.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce817e404---82166100672.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/losunis.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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 17528 bytes
SHA-256: 7993ce4f248a73b30c265ee732c600d5f662727e67a46242102a9d65fa74999a
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 11028 bytes
SHA-256: 685ae6c666fe8d8cd1f05bae69555e16ff8ca39b13a2f9a03eb7df5c66c7a36a