Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7ecaefad213061…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 06:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbe86a2cb1b9c5d1d1d7fede64e6ea87 SHA-1: b0af8e83c562ff4e2cdcdd06a7b9d7a148460bbf SHA-256: 9a7ecaefad213061eb447654facca5885de9b2deec7d070af58159007132f9c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.huntsvillepr.com/files/files/rikeragusezi.pdf In PDF document text
    • http://skogsformedling.se/bilder_umeny/File/nodofotubanifunavu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/44237842528.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907113623.pdfIn PDF document text
    • https://isosklo.cz/uploads/38048365999.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/zajexesivinoxak.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lopipobotinoto.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/81208474659.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912133729.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/xabukubodef.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/21745337993.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/41892032594.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/91380560134.pdfIn PDF document text
    • https://terracell.pt/images/file/52546491666.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/tifamunub.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/17146537645.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f608da8f71---2352520290.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/79849722129.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wimuli.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/98116319795.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27b82e49c---putifawozuzivabaxepojuda.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/11588e7f847a135451d9433849bd9582/98461566504.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c96956ec0---kolajimomelugisenimojusa.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/62952215702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=photoshop+crack+windowsPDF 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_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 18056 bytes
SHA-256: afb21456261c92ddf327339c731eca79147f4784647168dd2eddec0831f6bf32
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 10612 bytes
SHA-256: 1cebaf9c8d3126afd15ef52e64c11fee27b61535642e50cfb76eb89ccea68fbc

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