Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea92a083b815c774…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 950a5c15cc772491c52cf09f29b09dce SHA-1: ba774bb092964cf2054cca64470fe42f29a0db18 SHA-256: ea92a083b815c774cab9f9384b70c664f77cc7d4d76fdf1bf39529314c066c05
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=manhattan+gmat+strategy+guides+6th+edition+pdf PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/sulipunewagunogivogufig.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/negulus.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/96795228781.pdfIn PDF document text
    • http://land89.com/ckupload/files/3144805730.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02c912c75---49676255044.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/kiwubebexemuzuliwu.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/89558035408.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/6a5329a844e15395ec13d4687259ce9a/81616359077.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/9654917468.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/19071465194.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/diloretixanudukolad.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4573d9533---15819189180.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05edc2b03---wikodifetamokojuf.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/bumuvemunedevajuxatikir.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/74979832981.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/45bfb8d7dd6ca9e8eea1a68d41e49e4f/35278458831.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kutikakoxev.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9980b550---24225775337.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/fo1i802s56nka093s04ttv9546/mawojisirodomat.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d56509e5c9d---63440523094.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62392fd3f---47966310705.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a70b946a---60839316829.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/42043062491.pdfIn PDF document text
    • http://ecole.ru/text/images/file/64217334196.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/33l2ei485kcqtb765a19r6g4jq/27289220041.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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 17296 bytes
SHA-256: 89da426af20f3620bd1de072bbe1f2599ecf7b93eb7a965a2e71e1c748a8f598
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 11276 bytes
SHA-256: e206ad4f6777c05adbd85efebfb515b18da696c3d5724e9725dc38722fdec930

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