Malicious PDF — malware analysis report

Static analysis result for SHA-256 20655e6359ab7d51…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37396afb91d321684f4fdb79f2fb3310 SHA-1: 0a7cfffe276442f12e5adfdc11d75508a7935c33 SHA-256: 20655e6359ab7d51b16dab7c981970b4994dc1ed0361698e3de3bb1376263466
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests a phishing or malware distribution campaign where the document serves as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://portalbime.com/UploadedFiles/New/file/5702988862.pdf In PDF document text
    • http://studioiulianella.it/userfiles/files/73449183584.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/97433244765.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/33740237284.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/43987267697.pdfIn PDF document text
    • http://mweb.cz/images/file/86204441161.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d67516052---risusoxefipuduxejavix.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/30648047993.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/mofotarejofuzer.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/lojiveratebuwu.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/75436607097.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0543ef4c---vajigibusetoxaxumare.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/27609786552.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/872bb5ed1aeea2243b2d77bfcef568f8/87731370346.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/41967806900.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210911113107.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/49391794247.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/2904548456.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/94181805053.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/sisopep.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/99115711830.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/62379082003.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bifodoroxexo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1bd59286---milejet.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7f8b3c9de3443fe2f1f1574edac1f355/zamoninikeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=10th+biology+book+pdf+downloadPDF 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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 16820 bytes
SHA-256: e7e19bdc3264e560fd12d09e17ca48567d0f51c3f7d851520af59c75f5d6b054
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 10884 bytes
SHA-256: 60a4f4ab99ec44f24f0867804b17f717ef696895909978d5ea78fcbbb2fe58ee

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