Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f87071c73ec7cdc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 01:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9aed9614e07898d0af53855671827a9a SHA-1: 61633de686197483735af0f9ae30d93d812b1719 SHA-256: 7f87071c73ec7cdc2834140198ad0f36efe4c7830101a2789a0c35a86266d249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 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://midel.me/userfiles/file/640879759.pdf In PDF document text
    • http://canxetaidientu.com/images/file/vibosipufesiwubafevog.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/kezivak.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609741044ef8b---44233611695.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d643900f7---72526238894.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.pdfIn PDF document text
    • http://secretinvitation.net/images/files/rewijixasubojudilegi.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/56793371779.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4c17544c---fawokukuvefigobaxuma.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/pesujalarolimosepeboxex.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/vojuraluwexotazatogur.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae891a5eb0---pisev.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lalev.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/tororonunikamasotoke.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/79788036100.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/zajumebudaxuzepomu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b72d674a0b713d3220da9550d4a3677a/xopal.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a565c169c04---nijevulijozur.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/78895355106.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d9f1b802---welibivovafib.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/gamipunilodozoxibigafu.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/zoxipevojoxovikaloburudew.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/16215413073.pdfIn PDF document text
    • http://temple.mo/userfiles/file/1154954346.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/mujufepibe.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb8d1cc4c---kuromulodij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=world+cup+fixtures+2018+pdf+downloadPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/gotujema.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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 11396 bytes
SHA-256: 38dec756784e0caec4de5216715da94faf36c191a273ea85d852e45c78f82e7f
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 17648 bytes
SHA-256: 677a3add067f95d47019d083cb0a60beb13521d19430733d90419d940699bf41

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