Malicious PDF — malware analysis report

Static analysis result for SHA-256 677c1507187b24b0…

MALICIOUS

PDF

98.2 KB Created: 2021-08-04 05:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02258e2f18ed847415dce4833b6924b4 SHA-1: 02a43a6e2ae129f0ac1f790995651fc9589d71ce SHA-256: 677c1507187b24b0542d5f21c9980523543b550e8fccbd637d9d98b28a9dce2c
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. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous external URIs and a link farm structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://backkwang.com/userData/board/file/jusod.pdf In PDF document text
    • http://guitarenko.fr/img/files/biduseveko.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/13622047019.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fcdca1a38---givarixusefux.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778821de07c---65159489058.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/99120772363.pdfIn PDF document text
    • http://sam-global.info/files/file/75586518859.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/88363591432.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zakewizudor.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/dedozaj.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210611234832.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e04241582---47525708714.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acd001d935d---jakovikap.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/cc4720268af860d950b9e47d1881ede3/72285951044.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/medalubato.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0cf6f34e73cae63c13ccd9c31dd06c25/28355237350.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/b50u6sq62vuavmn11sb0is2sh9/21781161054.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/84371058491.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810f00933bb---54481284443.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/lajujanupitafubusejagi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xemup.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/29971945054.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/77967258151.pdfIn PDF document text
    • http://etnorom.hu/pictures/meridepafas.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/xuwutabubekomitexerunutor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hack+smurfs+village+iosPDF 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_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 19784 bytes
SHA-256: f42bdb5b8d398876019529b38829d10f93a8a25c3bd9c3e31315865bb6aeda24
font_01_sfnt_off0001468c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468C 11016 bytes
SHA-256: 6f88870d7a04b54ec0ae8f5df44bca5293080976a325aa6a637973a671243615
font_02_sfnt_off0001603d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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