Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e585b744fd41269…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 01:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41fbb0052f3983f3ff0c52d68e2ccc7f SHA-1: 93bfbea190d6fd77d85de5571328982728902fc9 SHA-256: 8e585b744fd4126936e032690558690a7cf41c6ef94a02a397bd3d1d17be7366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dharmapremipariwar.org/userfiles/file/97164842398.pdf In PDF document text
    • https://istocdukkan.com/userfiles/files/pepewodenob.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff2c9b94a---darezipuwexerovin.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/49647042693.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c2449ccd---48423662845.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/pupunifutesitemo.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/22520695369.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/73825426814.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/legojilujixupikolu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bki6snls6dv8tnp7elg3k8lv0p/rivemubujatavetetowud.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/10552053740.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/41785496998.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c30910069b0---66119472965.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nimowi.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/95284464503.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32c358cd9---835266366.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/76799964236.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/237b27321b2ed1a77531b0e66e42bab3/noropemev.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f88e313da.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/lobedijigavorirapagediw.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ermveklmp4igj5qqego4qt6tv4/63855067317.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/681e0dd48a494084cc32af661e1098a5/kiwewovefexenijobutem.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/87014814327.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rivevokebufizamuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=videocon+d2h+super+gold+pack+channel+list+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_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 17704 bytes
SHA-256: a803c4d8f908f4f3207ecf1b80c0c1a17199900dc7f093454a92246e7c458a0b
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 11180 bytes
SHA-256: ad5725c673b1c85041437ed43b53ccb57719e8c21050368401a5169d7f2a0cb4

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