Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1032e59541ef40…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 08:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 04d73da5eba31001790bdd6ab2ffe863 SHA-1: 00da445990324dbc0d61c77918a81974bd4e40fd SHA-256: 5d1032e59541ef4006fe53d432ef175df3767a3cada4c55c8c1660dfc4980dd9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to domains that are either compromised or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=eyre+peninsula+map+pdf PDF link annotation
    • https://ntct-dz.com/ckfinder/userfiles/files/90847562747.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/aca9eba119d6529ca02ef6064aff066f/wefolexa.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/xurufekekafulono.pdfIn PDF document text
    • http://inncredel.com/uploads/metobunotos.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/tatomitepulewugovuraxi.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/4851719519.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88dac3b7f1---60782907806.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/12197916268.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083591d004ee---95116407810.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0056896dd---64476508303.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b8b9bc3dd---9043354748.pdfIn PDF document text
    • https://sanidom.pl/img/file/badanikibulakusuzaja.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a632bad95f4---17608118544.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/16273767313.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/87830966473.pdfIn PDF document text
    • https://questyme.com/userfiles/file/29661266637.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0412e2e177---zafadano.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/69789003548.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h8b8c8nejq3vi8222srkt3i7o7/45036840983.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4d78cb877d98c2071cd047f0f2f13ecc/15327232123.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/76362036758.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fc017ec7---30689731091.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kumelobopijolepedeposelox.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wibizojamonotipolunikixa.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_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 17356 bytes
SHA-256: 101c73f1bdcb0be67f3d078b8f19d271b84313966b571220fa8a87d5121c226b
font_02_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10640 bytes
SHA-256: f3c5de40e7139ff1c08a666fcac7b29107d4723c266c981aaa83e1dc48d0e025

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