Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3cbdc04625cc63…

MALICIOUS

PDF

94.3 KB Created: 2021-06-27 09:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04aabf5ec23053a37e8417aa7d72be36 SHA-1: e24a1a6f25901451a8375bf9d858d60b02573d6a SHA-256: 1e3cbdc04625cc63ffa5c9ffa705111ca7d363ade159ef9ed8856dda6ac18eb5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host further PDF files, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nhlf29g0nb59dfvbut75p4ppr1/68928874938.pdf In PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/sibipoza.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vkefsmrj83cibum6io521e2mkg/xezurekoxi.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/38163345435.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd38190e2---11637462500.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/09cb4fa885aa964060fa4b4af54a5c40/goxutuxojitizemi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098405fb69a3---derisibokotopigizebasib.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f4bd291993671f92e9c0fc20fdb0fc5b/sasebamixuxavatoz.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/92349084449.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/limiginexopeweju.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782dabd44b7---41501339713.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/87773617707.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jugowanu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084228dcdffc---belejipeko.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/98203037627.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54897e842---79754826643.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8a73b741---47102223048.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7538a7c5de0ddecbddbf6abd445bce26/36769361853.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eeda81fef---14026060511.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/28409433295.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210619_4823EA5B5A3CA8BA.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/45816072906.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pm7039lmqnga5lrrkb89th0dj7/kipufobor.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/388c6bc2512d65d704ef28d88e6244a6/risokudinavevatol.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/e4f3aq3dkguj19h65oskrrur73/bidevarinik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=you+gonna+have+to+serve+somebodyPDF 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_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 17436 bytes
SHA-256: 1b5c948869e742c186b658e31ac79ec6c11cec9362f930eafd78c19458eb2f66
font_01_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15301 10960 bytes
SHA-256: e6c34d8bb9643285bc9b617c56b14f12f4fef71b065d0863ff06a7bf8e5467a6