Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f9ecc09301a457…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 05:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af0a3390d54e8463de4329ef4fd4a824 SHA-1: 350f5120f9d8832dd41ca6a8be337ac002e17283 SHA-256: 08f9ecc09301a45745657a4cb51b951654dc6f6e343d8509a54515fd3dc52080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=cost+accounting+journal+entries+pdf PDF link annotation
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/padovarixuzogo.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/kopedegat.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610adfe307b2c---55236558807.pdfIn PDF document text
    • http://darec.sk/files/files/xifirarogef.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dnlrkh6aeq2f83lagnioh5kb44/27036291348.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/58077594823.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/jeruzu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b6a2c826b311e3c0f632161db3cca9d3/taxirovimagadodad.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wiguroxalat.pdfIn PDF document text
    • http://pelicanfinancialnetwork.net/ckfinder/userfiles/files/gisusefepi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021080603043173499.pdfIn PDF document text
    • https://birudongker.com/contents//files/41718703836.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/3509727935.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/lipozama.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ce1e4caa85e49f84ee4828b957ef0c1c/16272517782.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/sulixobivewut.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138215943463---zamolobudat.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/vexebek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611fdef63f04f---64780586330.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7f476c6198210396298f470d9ee73146/58517405863.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c1d4c4da---sunoxowezofiro.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u2rn30ooh7cm3h9oh5ccl5hfv3/pedajubujaj.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/dozutad.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 11056 bytes
SHA-256: 758d17f45da2d226312a494e8ec493e188a540d086dacbaf30a9213cd77fe3f5
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 17716 bytes
SHA-256: fc3a5dc1e120aba1c9bab9b01a7f3d094ed8478c7133a0f4a0437c02d4393797

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