Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8275880102f8890…

MALICIOUS

PDF

97.7 KB Created: 2021-06-28 01:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5970dfeb53ec65dbb280c6d2732264a0 SHA-1: 58ff69ada7c239ab0ca71a9c7b2dbf18effd6cc6 SHA-256: d8275880102f88907d31f9d427b56b6e5c31e9cffbaf086c88f31e45def6d2f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for distributing malware or facilitating scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://catamma.ru/uplcv?utm_term=what+is+noun+answer
    • https://schmitz.cz/res/file/91711097058.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/janigerikuxug.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/781mg385brnts5re4p22lr6tl7/megapukabuwanoloxaditexo.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/40878a4e289caa67cf08e6fa788e73ec/38075148211.pdf
    • http://mnogonomerov.ru/uploads/file/73914779706.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273f8dcafd---82105871320.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608941a0b59ee---siredovafixud.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/93243307d6f6faf20c9bdd29e5b2c887/7505207243.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086261a6c2ac---doparaninojeked.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087859e80f03---23543661963.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ta2t7jb6mrcji83pmluec2n7f1/givisusewamune.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/16893e7f924cdc5a9ceafc6e34512a92/dawuvimidazavemowatagi.pdf
    • https://confetti-seasons.ru/upload/files/semujevekowad.pdf
    • http://rspon.pl/images/wyswig_images/file/21274521307.pdf
    • https://szabobuszrendeles.hu/files/files/toxek.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a5c30592---suvatidorabumak.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/45239385104.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42ec2d087---83675143177.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e895b49d---furozizosupegafu.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42513fc66---27037595688.pdf
    • https://fotofidelity.cz/userfiles/file/35479487864.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/tilepuxurivubuf.pdf
    • http://mai-colle.jp/userfiles/file/suvuponagile.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7bf431d1---80502351425.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/69123988586.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_off00011937.bin
cbf473ce6ae458980295909bbafadeba86c5196c314d516a9218ed176dec71fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 18768 bytes
font_01_sfnt_off00014a13.bin
96097f292308a92834eb54e5724605de50afbb449718112657c6a061bfeb6e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A13 10340 bytes
font_02_sfnt_off00016179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16179 16792 bytes

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