Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403882cdc3810c8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 20:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6aeea30bfe4f9ef88806c63afb3fba67 SHA-1: 2e24a2ba516259f0296517ba57ba63524a44ca5a SHA-256: c403882cdc3810c81f520537cd75dcc83e49a1dc70bb217e64bc1225ded3f4ba
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many hosted on potentially compromised or disposable domains. The embedded URLs and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://qnzar.com/files/petemo.pdf In PDF document text
    • https://iwnta.com/userfiles/file/muvasopakikokofulezosoge.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/34942043694.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d14a5cc02305519b5ccc43aae3ae00f7/84179087367.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fabezopodadafof.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/forosimeluboxoxutabopik.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lirorob.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/5184030710.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/pasuzolapularo.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3l3ds8j53f633dege79vjbpitl/xisurazivafatexoxotareb.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7186ba3f3---satozonusiwexumovux.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc7bb0105---xonosasako.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5645760db2---dapijoxusalefoxirozuki.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/59442277887.pdfIn PDF document text
    • http://kahasat.cz/data/file/webaxifovuvawajirevo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c4e4441063aab3cab299c17a595ecb87/xavadowelubugo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/610dba01ed086273e5ce7e32e8fe128a/wogulif.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/74f2bff4be55b77c71026ad67809d6cd/50218514846.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/ligukiporafar.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/t2mp03anf87vobg7jdhaka5o2o/wegaboxiledobujipiwajo.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/80956198046.pdfIn PDF document text
    • http://mega.kz/media/upload/files/nedewokererajiwodefudazim.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/ratujawezaganavikebipat.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9694b9e5---55568412548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manual+motor+pivotante+rossiPDF 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_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 18860 bytes
SHA-256: 556236ffe7e7959caed2364438b0dcac5fa569ce9843714139a5381a18e9cc51
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 10572 bytes
SHA-256: 45281e72b862893d712ddd8116c81eee297086341c72844ad345c6f40dd6125f
font_02_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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