Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1a481f602d15a8…

MALICIOUS

PDF

73.0 KB Created: 2021-09-22 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a62900df7eeff15588806f9cba895276 SHA-1: e677ed8bd941d9e1bdeeaf551522eff208c259ee SHA-256: de1a481f602d15a8e24e37e29aea1c299ae24d562037580f78577acc9bb6cb36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the malicious redirection provided by the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nuovojob.com/userfiles/files/37276933661.pdf In PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915171357265518.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/eed75b8383a97f2fc19d7c96aaf6555b/wowilupibukozupu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/lagiso.pdfIn PDF document text
    • https://peterdegendt.be/file/wemipiwev.pdfIn PDF document text
    • https://betsin.org/userfiles/files/1448272676.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/luwoxakonetetovupo.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/gamejose.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/76617801389.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/33368735323.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363495262ec---fukekib.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kafubonigurikenavekizenad.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/67801093264.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/49452955415.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/88629134277.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92477310022.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/16/65746315881.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/lirizujit.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3gumk5qrkrrbv8ad0meh42p6d0/vegunejizoruni.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/82579513965.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8d4b6866a8d0cfa3066fc39c5d9b/wotutexolirogolugo.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/37964345422.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/48495316969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=magnetic+field+intensity+formulaPDF 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_off0000ba2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 11024 bytes
SHA-256: b325206f05108ca5fbba6aa88d1d859a0f8f140d2a48ede49ef59b71f4a1bd50
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16688 bytes
SHA-256: 228f7cbf79c7935470564d9a796b4f33a39cc13c302df815d62248cbf0c0d922