Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac83ea3f990d278…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 19:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed74d301c651df74174de94b46e2e768 SHA-1: 65507984d7cefe2d711da4f4400aed3f5a4e5d82 SHA-256: 7ac83ea3f990d27863118f94d5ecab8952b7f690921fb02f461a9a90b04382ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The primary attack pattern involves luring users to click on these links, which likely leads to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=decomposing+addition+worksheets PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a24b818a12ecf371826acf7398bad9b/83765062901.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nasebogewebuzakopalopigo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878af6e88fd---xuzalisigixunisob.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af180ca2ba4---58687166039.pdfIn PDF document text
    • http://amdind.com/userfiles/file/24444155123.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1b2765e6---jikeruvop.pdfIn PDF document text
    • https://nadamasristorante.it/file/juves.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/29m8pljm7956dimgpouuqgu3e1/lujeledifeja.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf649b6c1cf---4239688982.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/vomobugemuribuxekijunazu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dubewagawuzi.pdfIn PDF document text
    • http://atkarisuli.hu/userfiles/file/talepesozumexabizuvo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e0d7aa2e---sobesuj.pdfIn PDF document text
    • https://memoservicesrl.it/file/79745644919.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/8413113470.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zobokozusepaludipebedute.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0c2cd4bf19c1f82548861dcd24efe5e1/14342550797.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3190fe888e8d4180c2b621d8b0063066/vaseminikimir.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/49077179514.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607134c0dc1bb---sexofebaxobalozeruv.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/023d6a7ca40738cefbfb559fb0fd0291/19089925915.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jegunavosutulatuf.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/89856355153.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbfe24f41a---22795009732.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 11092 bytes
SHA-256: 8c1fc5154beef3bb924ba36700e3724bfabe03fb6c6fe2c3a716a434fe30155b
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 17264 bytes
SHA-256: 0eed1d8848d9ec0a2583fcd4392c4b4538442203ef41f84852246537c90fb735
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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