Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5ab43f0ffa8e47…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 07:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66c4dc0fc4ded7e70fc33fa9acc25238 SHA-1: e15610392e94f9acd989da81d5f430cc68f57a05 SHA-256: 9f5ab43f0ffa8e47d1a4f0a68284fed5a823d3d7494ec5ff78baf5542744edf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=criminal+case+android PDF link annotation
    • http://gniortho.com/files/Upload/file/57612558183.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/xejaj.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/xipoba.pdfIn PDF document text
    • http://jump360.co/upload/files/20210916233634.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/naredebezigevi.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/31337308626.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/zitugep.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161400f2ac3c68---lifasezi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff80998ee---21408373456.pdfIn PDF document text
    • http://446888.top/userfiles/file/gexiwuvarobeg.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049076015d---58997191341.pdfIn PDF document text
    • http://ssp.by/var/upload/33562562590.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/27343841069.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16982552193.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4571cf452dec7b88fc0cb0076a357c67/65613805170.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b29dc8283e5153a64b90ff075a7693d6/kejizujokadegofonazoka.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/79189903933.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/14841050241.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobujumobig.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/fokomutalijobilo.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/botilulidutikiwegunetup.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/75350883008.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/kexek.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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 10464 bytes
SHA-256: d6e6c8c098b7b6890b3a15d058a3383da6d1f2f0585daef5e875a7841ac82fe1
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 18248 bytes
SHA-256: c6bb338dbac28947eeda575a1bbb70e40975e0be04028db9d6414fa413ad9c57
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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