Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3abf87ccc8a25a3…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 02:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69af12d850480b58dc83ed807e4971c3 SHA-1: 27446b4009bc3d4f729eab38bfd34bde447261e1 SHA-256: a3abf87ccc8a25a3e8bdcf082067de1aec627c295694215d964f1921561e098f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate the presence of a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cortemadera.com/wysiwygfiles/file/zasewetelusole.pdf In PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/45177451503.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xivexutafapixipize.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b9410cf1---93276046279.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/48501710038.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/89334604687.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/74799079764.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/40867020288.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160deb9d83b0b3---putokifutenexe.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/78135650800.pdfIn PDF document text
    • http://techbis.pl/files/file/869520234.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/5224190783.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/73tr44s19ir8tqt3avkq8ata9s/61400039399.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b12cbc834---dokazigogese.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/85f3ba018a20f73e91480548c49d4f78/52958013355.pdfIn PDF document text
    • https://ntc-container.com/upload/files/joponelezunirirevox.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fc225c9b---regofizexumu.pdfIn PDF document text
    • http://cosyromania.com/media/file/36546769556.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/16955996066.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062508282136.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fokemomidetugadir.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/pinimu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zinodegiginom.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/99725529377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=1000+yards+to+milesPDF 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_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10496 bytes
SHA-256: 074904f48f6385ff086ec10d469082208b2d3c5ecc82670ae5d455d020a37e8c
font_01_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 17312 bytes
SHA-256: 51f333948a8c1a27d7aa327e978a2f8f0b8af117e36440b7dbd53f1e09abfd23
font_02_sfnt_off00013a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1