Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59cf6aafbc77ff8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5761cbff9f693b35d80936953fb5736e SHA-1: 0d8c7f97128a175a4f09a716919d1aec7133741f SHA-256: e59cf6aafbc77ff8ecd239f60a6fa19d8b920e97d2a557f4b96b77e7a89646e0
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files. These linked PDFs are likely designed to lure users into downloading malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f682dc345d7---92704229488.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093bbbf58759---vogogowopitilojek.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/jumonatikodatigutewumer.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/gugab.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuxolazojajeximolutinoja.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/45215087005.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/wusigodoj.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f712e8611f---jibotarufakabonutizeni.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6fc05ff625b0f399e4fa35262872094f/sorivabixi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb62829371---wegexusisegitonesapodap.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/barawutikinejowefijanozi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zokosedetepizejitedu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vuwavabazeputixo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062808193273499.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/292mtdugkgv6pm25lq0931e7fu/6623182318.pdfIn PDF document text
    • http://besteva.com/upload/files/83195623007.pdfIn PDF document text
    • https://anfauglir.com/images/file/wededog.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/926c85ed1e2d919669e22c12bcb23024/rujotikubugidufos.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d43b219bf3---69698383470.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/fejekivetu.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/wanevatejevevokanewakog.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/rudadonebovivufilan.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/refakolotanarivalowolip.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/gasazusagof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+valhalla+saga+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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10508 bytes
SHA-256: 91244974131904e3f3110bea38870b345415f5076b4a3e9ad67cf5dc7d2a6602
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 18836 bytes
SHA-256: 781278ef9daee83e3c5520653bae0431857399df8fe0e4e19f2d2bcaa1e81f3e

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