Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6858c1847d13590…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 04:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b78a7c6d1b6f774b4ad2dec5282f969 SHA-1: 583d16735ba07949343e4d4966bd0a1fcf39ffe9 SHA-256: f6858c1847d13590ffedf42eb7eac9a16b172ace3b4a6da57c69b5e126f7865f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate embedded JavaScript and a link farm pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates it may be used to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://memsports.com.br/admin/libs/ckeditor/ckfinder/files/jozuwunano.pdf In PDF document text
    • http://devveb.net/userfiles/file/87363617964.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/ravituz.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/77562298573.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nulamugumi.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/fopomanugadobosezesowurul.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46fe41d34---simuwoxexe.pdfIn PDF document text
    • http://skncn.com/u/files/8378943346.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/bowagoluxaz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f0c143e6ac1bc1ae727a82ef5b3892ce/sixosoriso.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/91162940664.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613314557a6e4---guwogawidepa.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/20528316737.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/62244109316.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/78709080213.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/5691122263.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a0cbe734---bizag.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/52987456602.pdfIn PDF document text
    • http://sergeybazarov.ru/file/65693648617.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/tulerapolekadomemem.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/felejezi.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/wixoxeleleruxivisetorusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=root+of+minus+1PDF 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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 18768 bytes
SHA-256: c20237ac8e4e9a117f1b29cb9935f0c250dbd2eb32dc9fcb5124716854a3df7a
font_02_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 10132 bytes
SHA-256: f7d968a469bc24330c8190469acb2aef7ade316ad6f0ebe59b9fee89613b5cfe