Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff71dbb40802a326…

MALICIOUS

PDF

100.1 KB Created: 2021-09-07 10:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89a996488ece011bd25e55a942a9a3b0 SHA-1: 5e6a0503f81ee9e8091c357c269e619ab4b5e72a SHA-256: ff71dbb40802a32675da5845887cc4e95a10106d41bb9d40c75d216d8735ecc0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many distinct hosts indicate a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=siemens+snmp+opc+server+manual PDF link annotation
    • http://iphonedown.com/ckfinder/userfiles/files/74974234689.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/37082416463.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/76888906889.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/jurawavimiwuvajit.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/7427066019.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a0173089---sabebajosokojexijusa.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/jemawuxi.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/45166283210.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbe2f762583bfa265ebfa74371b8aa98/65421426285.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5dc6d8460c7eb0bf8f7f75141ace8f1b/xasepukusilesejuxuvutu.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/20713592696.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/lojivufabuluperik.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/romutudi.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/81824061370.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/miraxi.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/vepufewaxozigiborojujaful.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3f37957c35ce471b8f22baf0f7f1d3e4/95560596553.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jufopisizumu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/795888e9e1780147d6537d0c835af40f/pisuvusejig.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/tegalixan.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/2797440700.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210825181515.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/99561186314.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab415b64930---kevakotukosetiwurur.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 2040 bytes
SHA-256: a12db9782a593d809c1073aa1ee49175ef19a1321a0fe20181183dc03c11189e
font_01_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 21320 bytes
SHA-256: b621cb91640d3e586dc9a5ba0de3ceb462f1bda7a1052ee5a4e7c735b211f620
font_02_sfnt_off000150a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000168b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B8 10680 bytes
SHA-256: 27e1cfe6527205fc2db419a64dcbf46aad201bd4808548c70c3f6760ba4a3b4b

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