Malicious PDF — malware analysis report

Static analysis result for SHA-256 502fabe420e8e4ff…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b864ccb8081f5fa63c8b2b94307676d5 SHA-1: 07ac250d05808d53edf35038edb8fddaca5392fc SHA-256: 502fabe420e8e4ffc3b79f480dbd00a212749e9b718f83a8ca2c237812ca5356
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. The presence of numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, further supports a malicious intent. Although no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to facilitate the download and execution of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://infrive.ru/uplcv?utm_term=apk+combo+installer PDF link annotation
    • https://searchlink.org/userfiles/file/15658717976.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/79185321543.pdfIn PDF document text
    • https://vestol.bg/files/file/17422475873.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/busisavapigadajefisajen.pdfIn PDF document text
    • https://mklaassen.nl/images/file/walivadiwabuwinozufofiso.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/vaviful.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7c6ad981---87819115628.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/5905239519.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/sedelivigutosaxigo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff13d839e---10362038284.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/gomepuluminitufalexemuk.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/riwuli.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/napulixomitotuno.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf89846946---37624106980.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe3d1b990a---lokevikejimevofufuzab.pdfIn PDF document text
    • https://nls.vn/upload/files/radon.pdfIn PDF document text
    • http://floramarble.com/uploads/dixowipa.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/77120143519.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/pofikedawatomuwerizula.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/kizeg.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/12389567003.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/61593157231.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/4070661206.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/kivojifarizufewoz.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_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10748 bytes
SHA-256: 11b9346ae7dc6d5a1ffc62f34d4dd653b3d6e5eb7d7b02b93821cf7926bf1746
font_02_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 16496 bytes
SHA-256: aa3595da9a77a6640e02ebf276625b418a861bc2731109bea5ef55dc2a169d92
font_03_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 18824 bytes
SHA-256: f98b55982d2d4e3c2e3df1768e01a9247aa17755dc7aff7a904c44e95ab857bf

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