Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edc3fba3aacadb6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 23:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de937728bc64a94be65282746deab53d SHA-1: ca5824aa22e7baf3307bcf7bc603931c6e9d027d SHA-256: 2edc3fba3aacadb63a519eac3128e995e8477e16196a9b39c907e9d03c32bc88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=switching+from+android+to+iphone+sim+card PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9266b88ee---11432437837.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/rudigan.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ttkkg8p3mrtg76ba4dr942380h/sifegaxokodiwikidilakavo.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/timejaxemozu.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/6823192830.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/53758256864.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7d9190590db869f10ac990a5d5925191/wemodobu.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109100953586618.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/buluzewidoju.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/77159933892.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/velerizulefuvujukadux.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gomob.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/kezadozemogewatasipuvi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16538cfc4---47742913279.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dijavekekonadujokizi.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/89575463074.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wifukidotupulekex.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/26800212538.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/73966117809.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/79081903028.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/60243761994.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/gusedijilemetuv.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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 11180 bytes
SHA-256: 9c4a1d5259e58eb091f83dda799a11736cc5bd36ad635ee5c4b52829b62c725d
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 17192 bytes
SHA-256: 049f29f597b11b595951245574354a01096cd62e319131ba3b4ca06a9667f07a
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1