Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88da4b9b9484d79…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 07:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06347a5104751a303cf78af52450dc4c SHA-1: 695ba59e1506fe12d228ac70a9478c51708c887d SHA-256: e88da4b9b9484d79d2b972c039e6db2bafe532943125accdd87588cf63095774
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355166537ea---tolip.pdf In PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/65098193612.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/ruburilekuxizejivujak.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/60410246032.pdfIn PDF document text
    • http://waypl.pl/upload/File/jexarowolefuwemadafipul.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/kepoxenenuzefukuxegukidi.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/34401818104.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/26536997898.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/mewumemav.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xodafajoxa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8258dc563---vokesigedezazag.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210909_2EAE0E63BC8EA092.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/41060575541.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gawasinapozizizi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f9408060c7407daebd6c6c858e95c063/xasuputobopanipaxosufo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/57414939480.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k5ikvh1ugbvr7quibtpd7pk3h4/21420818134.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/73299184327.pdfIn PDF document text
    • http://sgpeo.pl/users/file/71172932897.pdfIn PDF document text
    • https://kaimano.it/file/63317799189.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/12454537963.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/befaferosomifes.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/92267876175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=iso+to+pbp+converter+downloadPDF 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 10656 bytes
SHA-256: ac085f3165b9544fa2d64a5a2221b841afd9c023e835b0ec655c7009109cdbe7
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 17712 bytes
SHA-256: 9a5e33d93a64662cc57e05cefdaf266929d82a829eafcbcbe2e5f60d4e36546e
font_02_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1