Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4272c179d01fd8f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 19:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 067f5d3d0a8e03e18fac517da417fdaa SHA-1: 2dbf9f3da1661258f54b6c938a369060dbf8f725 SHA-256: c4272c179d01fd8ffc336ac15c24834d3e83eb072d67f255b80e9458c2c8add2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to lure users to malicious content. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://licorne-hotel-restaurant.com/userfiles/file/54057831421.pdf In PDF document text
    • http://sushimura1.com/uploads/files/14755300080.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210914/file/16315626377491.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pikezajimezujapolivazixa.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210917_E4C475BB1518A886.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/6059443618.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913115047.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e773a6663e---93695455097.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/gukipaj.pdfIn PDF document text
    • http://sin-hua.org/userfiles/lobinap.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cmj0m845faraqut216e5uubc50/bobolovezij.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/49d898525b56b379949bd172426f58cc/jigewodosinigarifo.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210909115937.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/18391834538.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/38810826363.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/basananagapenokur.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/rizizutomege.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/falefopidupen.pdfIn PDF document text
    • https://virker-ikke.dk/files/kijenu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/febejajonup.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/87094650044.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/77712928474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+record+calls+in+redmi+note+9+proPDF 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_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 10920 bytes
SHA-256: 899a99dd6701c9d5a6929e7142e870be20f77fc193235840887a96d0e3f8205d
font_01_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16616 bytes
SHA-256: 98f673472e34828c7c85238f0387bc9cb4356ea037d4d12d02d2a896c961b1ea
font_02_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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