Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97aa212bba76d90…

MALICIOUS

PDF

100.7 KB Created: 2021-08-21 06:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c982092d047776f404c98be358810de SHA-1: de3f7f6477b3e4627a8b5987a0c2890d35c2a0ff SHA-256: f97aa212bba76d906d60e051f1917a779c88e24ebcf11401e41f9bdeb8b260d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20c617706---vagogunisasemeponizomewo.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d749ae5b1d7---tuxogadokeluragun.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160876564e093b---2797083444.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/mudogibufesel.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/36388258417.pdfIn PDF document text
    • https://shidoremicrosys.com/media/nurimozanobezusotasojegun.pdfIn PDF document text
    • http://licausi.it/userfiles/files/5370652311.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/detevoworofewonumojuzo.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/94424482465.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/34639462131.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/83443826761.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13381249e---26541386446.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/odum6q0269j0r2b3f0tir90786/jiwejikikunuw.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6acc059df7---gexowaviwugofa.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097894f1a86b---31336012673.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/87f9ed86544b79a205216b9b604b633a/75905344094.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/chrvdmrglhqsdijqe0vhj8neq4/85550531294.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/69039978187.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210720_C4A0DEE0AD9CA14B.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a06738ee6---34985465299.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/724d30693e9cb94dd9f145fc2e33c4bf/refopima.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/8td12q62r35h9q1fgequqfb4j7/38178308631.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160de413c35796---71206885468.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bazanoruviwifukewu.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/bofukogavejonalozoduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+fill+bissell+proheat+2x+premierPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10956 bytes
SHA-256: 6f88febf55b7aa3b56a59be98796e8b190200218c08d8c9ec646b698b2c79c10
font_02_sfnt_off00013d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 17400 bytes
SHA-256: 8913bbcf0e38d1fbe19c64736d270b10af14f5816a62fca5dc7b213d0898a85e
font_03_sfnt_off00016a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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