Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45db017de1c2a38…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 15:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46f19e8efff89c299bf9a2976d6f0984 SHA-1: 55c843195519d5e36422de556e11d03b9a738d54 SHA-256: a45db017de1c2a3845bfc2c780363c7325a000cb3c4525841e35051f4f392364
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 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 https://pixomot.ru/uplcv?utm_term=what+to+do+with+old+samsung+tablet PDF link annotation
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/kofuwaxim.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/fofotupexerubin.pdfIn PDF document text
    • https://superchills.com/userfiles/file/17269483941.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/fadukakeduzebipo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/kaxibosivinojizodobetifu.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/sepawo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/368505527e57d85fdd711906f8a74849/tunomarunovixuzagot.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210913194519.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/vesulujaba.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/72249d482ccd150665ac65d70371d1d4/mopamevaju.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/puximi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614529d184fbd---90048979303.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fitevifufaxibaxuvu.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/wunetipel.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210925161726.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911010916.pdfIn PDF document text
    • http://it-hair.com/userfiles/zimege.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/gobiwapakat.pdfIn PDF document text
    • http://preiss.at/upload_files/files/36057020423.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff20fbeed6---54334110296.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/16736255299.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/3135144941.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/11866756184.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e342b9263---magalixepabubulukezafe.pdfIn PDF document text
    • http://actinq.nl/upload/file/76279019517.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_off0000b49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49B 10916 bytes
SHA-256: 5cb21326b102e0d5328091d63249f6f8142e222f3747d7e71da153f06bb94869
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 15084 bytes
SHA-256: b71bd7b101548788182edcaafe5057cf7d0e05b2ba5bd0f3d7095d7e79b5a351
font_02_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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