Malicious PDF — malware analysis report

Static analysis result for SHA-256 5976816597640f99…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 10:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c5a044bde4eade708041403ddbf6411 SHA-1: a31bb815a1e4c30fad7fbfec61c6af97d49711e9 SHA-256: 5976816597640f990f7885c8cbbac73a935fdf5db014cd9d7e7c4564ff5243c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a phishing or link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=there%27s+more+on+heaven+and+earth PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l398lb1jq9ar3n1ks6it9gj3d3/91082422405.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/28448788453.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a861f60a7f8127882bf636d37168cba0/80715281664.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/8836490938.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ced67b9510f7201d4bc493821ac59228/76487759984.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/60197114312.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/kajirewubewofido.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191e7392349---66136875419.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/10129232872.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff22b97739---vugoruxorateburavufirusam.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d01a6d72---goxetinevuzinileduji.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n3313quk1h26e66l4ct7bn62e6/93960203229.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/89897647666.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/sasegadafaxavixezenome.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ddf450b6de1e9677c5cb2d436d018d37/jusijifezator.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df4e199113---7601479697.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/971e67d1dab6fddcbd4cae496b5a42dd/nonibazogaw.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/mevewedumoxane.pdfIn PDF document text
    • https://cncunse.com/d/files/wugoronotekepefaju.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6n8huv0vsqef2mtdb4il76ip8c/47905104807.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5093bd6e5f---17123162694.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/kuvozijonapepunigon.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/78971867817.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/19389827582.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/dedivametu.pdfIn PDF document text
    • http://mebco.ru/images/file/joditekatigixuxinoga.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57a58a838---67806613815.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 10436 bytes
SHA-256: cb2e6a7d793aad1cdb3d99021d66329079b4a96f26390ef7eb8bfa17594fc9d7
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 18340 bytes
SHA-256: c2be9e3ff9da73bf058bc9fd7c1711cf8177cf9cc60f38c6b610aa90ddfb4bba

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