Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9ebe355aac0649…

MALICIOUS

PDF

78.0 KB Created: 2021-08-28 00:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b095f52dd14bf59b837ee689aa4674e SHA-1: 5c11c1db1c561b960c3fafec61614970c6f5ac79 SHA-256: 2f9ebe355aac0649856b73d49154cc402503e6fffe266e68e2d9d93882bb50e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68525d322---93259742890.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a02a554241d5699616db09090ce17cee/saduvi.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/91615408690.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/26545561183.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c3e677b5a---91185531608.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/medalagiseliwuw.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/2292538566.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831fd617136---9696325133.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16118b72723d7c---11584433583.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/89qiodj59bn5p06sm0s7dj5ffh/suwumedomojuxiliz.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/df0bc75ebe878bbf0bfbe280b720f477/84606674511.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/86596010714.pdfIn PDF document text
    • http://gardatrans.com/content/Files/50187294321.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/662783758044917a56a289a0c4d3a3c4/kufavegelawupeza.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tovonivatofuzerazamuge.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7624d89b85---83868921889.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/lepamud.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nemolif.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/makidiwamusade.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/29885289750.pdfIn PDF document text
    • http://poiskvod.ru/images/file/98459299508.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zinido.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0b2a8560---99701456554.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/21736110769.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/15392329209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+calculate+atomic+mass+of+oxygenPDF link annotation
    • 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_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 16580 bytes
SHA-256: 53365d5931ce88fcf89cba1a585a6d437aafcc85fcb4aa93f4b72fc50388d133
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10972 bytes
SHA-256: 5ae63c195f3d63fbcddb58d9d6a7b1d9f0c15e47e1fbd9453aa79718629f5a49
font_02_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1