Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a9d5766dfb5eb0…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 03:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67b73e35fca8e89335b2f57e790f40a6 SHA-1: 3361dbf2e9aa2e966a9f26538107e57cb64c1048 SHA-256: b6a9d5766dfb5eb08468df1385a03df6a377a4c930af01bb736b144d58d2ccde
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gmicropilotes.com/uploads/files/91161703993.pdf In PDF document text
    • https://belitour.ir/basefile/belitourir/files/zajedagojaxaneb.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/41058032273.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/safepetoxatelisebekon.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/51299951340.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/gupusagetugojurixo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613931ef05881---57880624389.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/lewafa.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/kuritugibesigo.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/69038117177.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/26826679876.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jixiselaredoxuromoli.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/vanegepa.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109102328508015.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j948dm9af9ddudcbuf2apqaf52/92007016387.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/zufuko.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/52823744266.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/53043448066.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bd234d1d642f5d6150fa08be7e9e6e1e/25850610663.pdfIn PDF document text
    • http://ndt-ultratech.com/files/66055291365.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/1519896302.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/gudawupinitirulon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ps+vita+download+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_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 10396 bytes
SHA-256: 44ed153c737a301e5ce26a67956dc06ac5aa25c8b9b9faa17337a0ff3a5eca5a
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 21636 bytes
SHA-256: f47b6bfb094b4aa4409529d229f18247f3a20ba2386e7df4bcc3a866e381249a

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