Malicious PDF — malware analysis report

Static analysis result for SHA-256 61783df057a1be8f…

MALICIOUS

PDF

156.4 KB Created: 2021-07-04 07:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ae61840e9ac2beec63dacdfd289df0f7 SHA-1: 52f1aa978344abe085d75d3bd9fc7eabba42ee04 SHA-256: 61783df057a1be8fe841a8860fe276a040dd2bb508e38e35cdb5f40e7a6b3005
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm pointing to potentially malicious content, including compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, such as http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zabawoke.pdf, are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/331e7d8dffacdff8d079ac496eeba0d4/benimidosegesuluxe.pdf In PDF document text
    • https://amatnieks.com/pictures/image/wawubagaxelenawisufefazis.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zabawoke.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56477733798.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/63833534917.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/15765302619.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/vapebifebajupim.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/28526076891.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae169ddc7---26350884382.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/61bbf8002ce1411984bbb463f1ecf105/95542983646.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/rumexomiveje.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a06dbd19e---riwurajux.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/9866795072.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/lidovo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8b863e4434a9d01bd75a8045cfee4e7a/rotimawajonekebugom.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/44943414529.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6e42f73887dc6bf56e41fe061416d495/28846699921.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/tejokulozupidabekinobap.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/xarivilozafoxu.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/19l9p5mlj59ep308svj4ir9cq7/resutugote.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6395032650d0682a855dc99b9203b1f0/90268206049.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/755968692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=great+gatsby+timePDF 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_off000205b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DC3 18372 bytes
SHA-256: dd24aec15dc1dc6d39a7a2e596b70822af653190a531511fac3c5117c5e054a4
font_02_sfnt_off00024ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CA8 10472 bytes
SHA-256: 1601ae87d04dead00d08c302a6aadb5c48abeee78f369d4f14585b09164136f7

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