Malicious PDF — malware analysis report

Static analysis result for SHA-256 492ab13848151a4b…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 04:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1cfa6af83a05462e48b76e885b5e56ce SHA-1: 8ff3a42740b249326d3fc7424fad7c8cd143365d SHA-256: 492ab13848151a4be2a9adca9d2198d90413670596fc98c53c694ad06a87a036
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which in turn host other malicious PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086471e32309---suxode.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca33674c24---taxaxizijamosiwudodam.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/susaderupidadajoju.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f3498ba---77146538091.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/banalowenirixokavodovu.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/91372303501.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a8521dc46521febdb11a6fba4a177b4b/dosutudijupomatawurux.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ios0cbti8s2496qtg2l01kjv26/48233805524.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/44196815329.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gm1c3jvksmjos4h0n9ce3cfmum/xugeles.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f3b8b7b4187ca5dcf3af3db96462721c/boxafimarekupezowek.pdfIn PDF document text
    • https://strechybenesov.cz/content/43666471021.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/tapubibedusixunedir.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/jeburad.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bee795ba524---wumijesumevonax.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713d55926aa---99008597020.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e73489007---53041503759.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zizaxupatarumexiri.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6cff9f0c1adbda02e9bc033c25c0d906/tabeligixuwekabuxonarivoj.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/47860095951.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/18432335673.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210628_C29267D7E707EDFC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=average+temperature+in+may+in+myrtle+beach+scPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 11104 bytes
SHA-256: a7f951c107c99ff5e8574056c7606a4ac60d938c7747d3264860482a32b95666
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 17060 bytes
SHA-256: 2ad3cea3c53881db7a1c793eb357d5ce9277f097c395f6a44c5fcd5feebb3ab6
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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