Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f3cdd1097b0f10…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 01:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 99800452406c482f31d4d8b0b22e7ca8 SHA-1: 5608e822cc9ddc432083da5926dfb14c0b88c9e1 SHA-256: f1f3cdd1097b0f10420fb793db6919b50b68cf40ac6038d817179848cb332f9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of 'utm_term' parameters in some URLs suggests tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=2nd+phone+apk PDF link annotation
    • http://tlca.com/Content/uploads/files/9354468963.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/10603871128.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128c86cd72---jejobutagodukekelozoromi.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/lokirasorarekutoz.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/malevobivolunaviz.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202197335284190.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pixol.pdfIn PDF document text
    • http://artio.pl/files/files/nikugowew.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/90456961499.pdfIn PDF document text
    • http://halaljones.com/uploads/files/49171528170.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/85646295721.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/moradaxufuzovirujomumomo.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/nonoturawile.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/92362877405.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109081936097242.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d15ec6a2bbdd375e5d4a7216d6c4219e/88156699157.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sumeg.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449f3587fb0---77444636280.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/38295902198.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/lepoponawefazekelilutofum.pdfIn PDF document text
    • http://vladekoservis.ru/files/29127801946.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/20338086249.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/rojafejizaraxiz.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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 18544 bytes
SHA-256: 5be47cac955abf6145670f668226bc3e9d696ffd532e2b6292e94c06745cdba1
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10100 bytes
SHA-256: 22f4a165f4cd7616478a1dcf9bf3cd236af547eb115f85e63f40e209adc82003

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