Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f3f36de81cabc1…

MALICIOUS

PDF

107.5 KB Created: 2021-09-16 23:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b9bda5dd21047f1d14f498bb0cbbe5f SHA-1: c666ba8ce6371acd9452e96c5edba3b79cb6f939 SHA-256: b7f3f36de81cabc13436e219b5f8f38be590c73b5e6f8c7d52bf4a63c5e10f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://krisoc.ru/uplcv?utm_term=should+i+do+karate+or+taekwondo PDF link annotation
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/19680165941.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/jolodovapadanab.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/sanapik.pdfIn PDF document text
    • https://uudanbury.life/files/file/79982100385.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/javirokagugoleropasofenu.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/37170207902.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/64855002991.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c637702558---zimimuxekosokupovu.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/37038628271.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zukun.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142b603d5c69---16133608139.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/womimapigopatixezagubiti.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bubopegitumabag.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zufegunefupu.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/97120333079.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/soperutiruwu.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/lemalataso.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/vugotodatisosu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/67717686642.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/24519528330.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec303edbc0---fubobifovimig.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/62856757643.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/garotevulakexixe.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/rosamoka.pdfIn PDF document text
    • http://mylodge-naoshima.com/miwaxofener.pdfIn PDF document text
    • http://agilesolutions.in/uploads/jidinejopanewefik.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_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 10532 bytes
SHA-256: 5416cebc85f8b627dc4be7501197b62d239e6b933e3e63087e5fcf7ff8c7c959
font_01_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 22904 bytes
SHA-256: c96e4aecf95eb1b19c3ad1f3a0c91c1f6df6593a8a5cef97bc33827defd4f622
font_02_sfnt_off000187c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.