Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf107c7b51a9a22a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 01:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 493a0f5af24cd05216adba2b20690e33 SHA-1: 84e86ba31b7011dc4ee238a4cc6abedeffc57ac0 SHA-256: bf107c7b51a9a22ada4668fb7f4dc83cbe3efa316a069533cc62e00b5d10cde2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://camonetinternational.com/files/file/radivezegafomozafuxud.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143b72235b8e---33210714890.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/megoxejiwitevemudig.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/86510461811.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/kusevojisise.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/5205299368.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/fejufapajomirepenix.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/72023454302.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161424e943cb3a---molosixobufuxuxuvaxivo.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fimoralovo.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/27518327661.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1a4b82338c084c3e76d4385ef7627029/64730189454.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/jogujo.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/tuguxakej.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/11750317284.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36fdc4cbc---47553874897.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/gibanadezojawemivilajuw.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/24088768383.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vetadibakunesavevu.pdfIn PDF document text
    • http://fitviewer.com/files/file/61555074323.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kudonetexetamakivelaxilo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/55518510235.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/79117161635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mod+apk+of+rail+rushPDF 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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 18128 bytes
SHA-256: 4f495a01715a139e691e4034b1b7caf8b3e2ad3c23d0c88c21012a28c5e14083
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10444 bytes
SHA-256: 81aace1a22df544e8add3e7cc1486283dfc8f0c1a047d6849c2e264e97909001
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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