Malicious PDF — malware analysis report

Static analysis result for SHA-256 6067549807add05f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-27 16:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13b8c38d2af49779abe8fee8649e0dfc SHA-1: 519306388f5a260b65d9596c4584b724ff3295e3 SHA-256: 6067549807add05f32c7914aa935036adc25d9be52601560ee60d5e0443ed47e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106bacf0ee---pefexij.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/juwitujerijomadobezakenik.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0b4720707627123ed187bc208c26ba80/witezotabiboxofamadawil.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/76967147671.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/31f9dd845ba31abff8146e53766d193e/jufit.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/62170458580.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/xajugomokanitubu.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/kikijojitegurelitanifiwol.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wexixamu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bdb8da20---5362300087.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8178366d9a3d42f10516e50a5dd145ba/21784309529.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/xapirusivosekibolewikimef.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b406fcc9a1---42928678879.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6093f7ab---kobodijavilozafegudevidak.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/65080993163.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/dasemezajilafoxolekuj.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/10092796735.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/vukiwodeledekaguxakes.pdfIn PDF document text
    • http://mayjack.com/upload/files/68532819107.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84a7c7ebc---jufenanitosujozile.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/537c14da7612989d7c5f8d1cdf929b67/mukabesota.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4c19dbae1bfc6b8a8a82a000b81df0c9/tafujolakukokaponojat.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/pijefigijibatabiribi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=annals+of+plant+and+soil+researchPDF 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_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 18952 bytes
SHA-256: 5ad502f8216fb6eddc46291bd988769eb61c27fc392d648223345928232697e8
font_01_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 10696 bytes
SHA-256: 255c54cc943c8cb660b0ffe0e2e2eaff42b22c1977994585e9c816ca60fd87b1
font_02_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1