Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852c6cf25d9221d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 03:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0aec90651283cc578a55c2b30e5de209 SHA-1: 5ff9247e798967449ad488b3b9c440a5bdcdc6ce SHA-256: 7852c6cf25d9221df82b3f5c05f2368a3b49bed16000eeafcbd2c68f392edc08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. Heuristics indicate a compromised CMS upload and a link farm designed for SEO manipulation, suggesting an attempt to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=gta+5+android+download+apk+and+obb PDF link annotation
    • http://gartenstadt-apotheke.com/userfiles/file/pisozegitakeko.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/vifowabazugenibutidaj.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/gisivatodevovilamigi.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/lajatava.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/56079151058.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/mumadunitozuxuxuzusegulu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f93defe71d4b01ba376038d4b1451c2a/vorekefizululij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2326ag8kcs4916sed3ifngch3t/tegowopiz.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/lekume.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b05f031391f0a41a4798d1638df5a7e7/patalulozuzanev.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/45462449.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/supogifoma.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kagonajo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614134039a9a8---29596801786.pdfIn PDF document text
    • http://vititanon.com/user_img/files/25461388385.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vibotarenapar.pdfIn PDF document text
    • https://samowar.me/userfiles/files/dokatolapisovir.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/pofebotakeseminepapi.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/safovosuvukupezasur.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/vixixoragituwizikigu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba1c9be7---39722026687.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/sepowulezijovuwejagozibes.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/tapag.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/87081983476.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 10576 bytes
SHA-256: c9096040a999b02ce3339b73fea91537e77fff6709e68ef2493899a80e4c4869
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 19092 bytes
SHA-256: f51683ae33cbef7fbbfd99b712eff2882800ced491c135fe9e4eefc6e004bb16
font_02_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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