Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39ee42dc33d0582…

MALICIOUS

PDF

100.1 KB Created: 2021-09-01 02:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b994cd1233bdfdd6fd0867eb56e34a5 SHA-1: d4bfcdffe4c122b31d5a2621a822d265b1b79845 SHA-256: e39ee42dc33d05820c984ceb9bd577df32e8a87070b4bd7e2856efed302fda62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the numerous external URIs suggest an attempt to redirect users to compromised websites or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm designed to exploit search engine optimization, likely to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=mending+wall+poetic+devices PDF link annotation
    • http://bocghedanang.com/media/ftp/file/52691069873.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e727c52290---92512382935.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd13f6415b---15319302192.pdfIn PDF document text
    • http://absigorta.come/file/60706423489.pdfIn PDF document text
    • https://windsbs.biz/files/file/wofig.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/liloderirulaliwadolera.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1807eb8f---6963114620.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/63068019632.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3666a9e68279a83b26045c359acac137/419024174.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/52409956780.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/semipojogegelavunako.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/guruzivamoxirawatamipiwos.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/11883664553.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b37d135fc7---nugovarunopivowix.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/dc5fa967bffaee8a076077b396891c25/liputokezofedodoworu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c6aa67c1a---tupawirasejavu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43e36729b---japijobiponexuw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8hont6ab1dcimg1f1dgdb16qm5/53632869886.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/3520750000.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/48183570205.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276c0e1fcc---zoguxerutefedipon.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079169abcd18---38495573478.pdfIn PDF document text
    • 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_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 10732 bytes
SHA-256: c7674f4f1224336a838bb508c32a87c3c3fd49327a32183dd0b05abe9f581324
font_01_sfnt_off000138ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15101 18724 bytes
SHA-256: 51ac5f3460f3846f8a015f1bf16936b9ffdeba6ef212b12ffeba295710bdbffe

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