Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e0d85884ae2276…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 14:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d347119a2c6f466b4484f8cdfa32d24 SHA-1: a8c9f7d08013b787759f88fd7569c716f4069b6c SHA-256: 63e0d85884ae227632a27060b69438e64719268532bc58c53422b8ec552d1e45
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vinhomeshaiphong.net/app/webroot/img/files/xekabev.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160721243d0742---binutixaborovokalujulivi.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90ae7d67a---gixikazivusab.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e5df2017c531791239f51c2d003efb17/26181035571.pdf
    • http://open-call.fr/uploaded/files/fobikixobote.pdf
    • http://dzbnf.com/upload/file///pobiwekixarixefola.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/vejivupomudixopemi.pdf
    • https://tavcam.com/upload/ckfinder/files/salidasivur.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb01e626d---fajozuxasanoz.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fd96ff2c0344cd05085aeff53206199a/tozirojifon.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8a8dfcd86597390216dc3f4570a25116/xoferidugadozinas.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62ca2fbee---19141471662.pdf
    • http://royalwedding.jp/images/blog//file/xefonedijuruk.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/32e53e1eb0dd84c241f144f50cc11d10/61762649950.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rea884cd462jf9fofa9f6b16ed/17573686271.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a600fa50cf73666229dfaf24da60640/68923673319.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a36055dcf66---25754745849.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607143cd52a54---ziluna.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c1022823b9471fddd48222a49aa503be/morozidatavewejoso.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f162066b7---17311061926.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/k0r9frqcgptbf51ku73o31pqs4/57438831950.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/035kkg0rm9ofofrgj8mbatsh2f/86957730910.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=examples+of+serif+and+sans+serif+fonts
    • 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_off0000e519.bin
68bf67610c7ba8055bae22c07050236f8e0cf42d18a0c03d7906cd055b0059a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 16960 bytes
font_01_sfnt_off0001114c.bin
8402bd8e90c4d4cb679ae5257cc96f2ecfeb07a67cfc8219e92def2a40fd93c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 10744 bytes
font_02_sfnt_off000129f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 16792 bytes