Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b9d09e0199704f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 01:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 139485bf48ba24a07e926ab7d7eb44dc SHA-1: 678a77e24821d75ccb9d30d489ff69b4a6615a59 SHA-256: b8b9d09e0199704ffe322c77cfed14da45cc802f4621e76448dd24263d9c78c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised or disposable domains, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/j29752s729qamu4carerd0ki4r/37159763838.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gihil7sv63acgno6e3ib7ulgdi/46300051664.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/68361491390.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/tivoko.pdfIn PDF document text
    • https://appfacile.it/file/87122475689.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608910342dc3e---tejediwikuretit.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/biterogerilozebub.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77ced4305---vurulevudub.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/baxidakorimolosisudem.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/22921869236.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160774a9a67bdd---56574910942.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4373600c6---jirutodotojemipiw.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792dd1e9945---30411234966.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/paxavedejekawuzinuramik.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/kubuxomagozipabadan.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab4cf2a4cf---kowoneligovenekiwodaf.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/bavapulomewuv.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fde6e4c14b9---53265624437.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xiragegusoweponola.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/beminuxosigibeja.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/15055672463.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/42752767086.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/dikoxipanurizipajo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2284e3fcb8c3bc1898be66a3584fe572/36166188786.pdfIn PDF document text
    • http://armanetti.com/images/24305991770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=biologia+celular+y+genetica+pdfPDF 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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17700 bytes
SHA-256: ae09f4ae1121b5fde279f243fd2bd6d69a4574c312757144e96e7e7513213716
font_02_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 10896 bytes
SHA-256: 48d5623f53d436915dc64d9fd6d2624316e560f4edc9f999df8c1aa0e3423583

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