Malicious PDF — malware analysis report

Static analysis result for SHA-256 396106bf3b58dfe1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 17:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b4b68047a30dc66557a83cb89d73ff5 SHA-1: 3f9ede247f05f34110bdae31b794f5ec4e626ac5 SHA-256: 396106bf3b58dfe11f18add964b6ee8a87105d6bf567beece227fb25b85d9425
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=asphalt+6+adrenaline+android
    • https://igraonica.me/userfiles/file/raxinesizuxufipifegob.pdf
    • http://limoride.net/gallery/file/29116023575.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109052201274298.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/kagagexu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfef3a127---nesomomogukerilomuvubag.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80f7f2712---boxixowogixuduxakev.pdf
    • http://studiomanzella.com/userfiles/files/40134215061.pdf
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/10891421901.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-10/20210910225104635452.pdf
    • https://fleseriuassociates.ro/files/file/tular.pdf
    • https://wonwon.taipei/photo/file/lisepolujum.pdf
    • http://vinhthuan.com/upload/files/vuwuziduxef.pdf
    • http://cutskytools.com/d/files/xivovagukikunexu.pdf
    • http://www.itidharamshala.in/images/uploads/files/27483103307.pdf
    • https://abisspaandboutique.com/nbloom/fckuploads/file/vomamadukolitemebexi.pdf
    • http://mispuntossaga.com/campannas/file/53483358187.pdf
    • http://pokwuttibut.com/file_media/file_image/file/gojobovipozemajavawawux.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/wagaporofilixi.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b686d68df---vobumazavenele.pdf
    • http://theaterbuehne-schwandorf.de/userfiles/file/tisavu.pdf
    • http://jmk.kr/ckfinder/userfiles/files/popewejisufin.pdf
    • http://pekingtogo.com/uploads/files/ginosodikizex.pdf
    • http://www.vljainandco.com/userfiles/files/4450343590.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f9c92160---43916926107.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
font_01_sfnt_off00010499.bin
10318ff9b2ae7ca5e919d7f2401b471d69bd0b54e2f03431f9021844e9b10f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10640 bytes
font_02_sfnt_off00011cf1.bin
2e381eff5b7225da4f9b3c61b94d9f233997915e347b9fa2a3af00f552bd4f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 17556 bytes

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