Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f64884f37761540…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 23:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5acd985797ebf9db11d8245f373cff3f SHA-1: 0bce998c2101c15cfbec02952805884f727d2ee6 SHA-256: 3f64884f37761540f9e30a557e5a95433a7913f8ec53797044b76c0d39abc1d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://archinfo.ru/uploads/file/6050296240.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e10158452---42222788249.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f229a84d---93001201342.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/olpkdqv44h44ad0fkgqh7tqgs1/pabufit.pdf
    • http://mgocsm.in/userfiles/file/4189283774.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/51224657352.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kazorutewunevojenetag.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/27977389918.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d500d34c---jenikaderepevad.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c706c9355ac---farofumitemoritilurereg.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98b421ca5---basesejanugexibalumada.pdf
    • http://amphorabeautyclub.com/campannas/file/26108986125.pdf
    • http://dtcguild.org/clients/80367/File/zarobaletufazezozewijatug.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9802fed719986a3187e604bf07a69b08/86584405982.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e021b42bd676be97ba7ca9ff13f76273/59168467425.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/505cde862a4902d6ef7c25b8754ec976/jufapolewirofidivexivukup.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rrcie7itedjf8k7ofgik4002d3/48579563316.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///55872551084.pdf
    • https://camgloberealtor.com/userfiles/file/98216666219.pdf
    • https://narimasu-chintai.net/jcfiles/file/sizuwaneseva.pdf
    • http://re-view.online/fckFiles/file/76372556468.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/imc7gn5d290ogegbboptvb961m/9972356170.pdf
    • http://phuocthuan.vn/images/pic/file/texikatelatetukositobiro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=long+day%27s+journey+into+night+summary
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b15fc4ad9582427ce1829c3a1e09ea12/digexorofibagim.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/winuporomobafisotegijapu.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_off0000f6f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 16792 bytes
font_01_sfnt_off00010f0d.bin
1f8479f137399199925aafdffa15a38b32e16fd5d69a3125ce71734e7e204b79
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 10984 bytes
font_02_sfnt_off0001283c.bin
d4d5811bd945778d6efad8b650fb05c7b1a3928159cd92c4e6a74c0bd8306b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 16720 bytes