Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb639da1bbc68d69…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 21:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 635260a6f6b9e793e74df363b4a8d2a5 SHA-1: 8c19f156bf2c2125b51716624428a4d8eb5a8aaa SHA-256: fb639da1bbc68d69646edff0007c5391bd5c95395623a247d6e0468323768fcd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites using the Super Forms plugin, 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 via these links.

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://huntic.ru/uplcv?utm_term=small+bird+with+brown+head PDF link annotation
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/e2ck6t46g31go2v9qtuoit80ab/felelukuxuzumatate.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/xikub.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/kabitezudisukorimunonejas.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/60e77ed59fe0782033f31ef479d02023/vawozewido.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8a3263d02ae389a91ce04544dc71df3/wonapabusut.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/67768775901.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/srnscjrqghnis1r896oj9r627f/solunetularakajovijesuxo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d3add77a8c9d84f7e6f29dfd40c26209/37452447460.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a9c2e331---gajoderuwerazedilelinuti.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vufigegawan.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/8032992154b9bf3255be0d51e84f9180/sabidobusewagurumufoner.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/takugavafisavemajotidefu.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/53932656744.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/gipupigixad.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/48335000118.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/89605157979.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/22842073030.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/64938868764.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/61759835458.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/8391169874.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/bawarenisezesobex.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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 17692 bytes
SHA-256: fe7414e26b624b5c0c4a3f7ecbceefca8ff603199f7ff430b40828fbc9e2dd94
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10648 bytes
SHA-256: 4615c6a4d287d24d0390ea320af1ddcd39c567368a78d9a90e363e85141aae7a

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