Malicious PDF — malware analysis report

Static analysis result for SHA-256 08139dbc0c2e5569…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 14:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56619a353f346600b8c316db4282f37f SHA-1: b97b72bd215eb33f810e3c386bd990f3a4fd2db8 SHA-256: 08139dbc0c2e5569d9db3a0748043c2bdf8cabc1b2db1016c482ef976a730018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kredoteka.ru/uploads/file/jilavatesodut.pdf
    • http://partnerplus30.ru/images/fornews/files/29805847571.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/48138109973.pdf
    • http://romento.com/uploaded_files/userfiles/files/rupijipalalututewujiwes.pdf
    • http://sevimticaret.net/userfiles/file/72611529435.pdf
    • http://www.culturehousesun.org/photos/file/mojuletumixigepunusa.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed589ea643---34096708339.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347dc4537a6---28119176018.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/92801570461.pdf
    • http://prinsart.ro/uploads/files/roginonugukenabuxebes.pdf
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/78252505760.pdf
    • https://camping-du-lac-dijon.com/userfiles/fichiers/77665458679.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904205951602342.pdf
    • http://3asoft.vn/img/files/sodel.pdf
    • https://griby.biz/ckfinder/userfiles/files/30107058046.pdf
    • http://cybernet-ap.com/UserFiles/File/motolevozukoni.pdf
    • https://xanbiente.de/userfiles/file/63352348782.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab162359c---20470431901.pdf
    • http://geodeslaboratori.eu/userfiles/files/wusale.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbfcc5532---savarapiselofukefi.pdf
    • https://fairtradeportal.pl/userfiles/file/busetebo.pdf
    • http://stagelight.pl/userfiles/files/zubon.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/67973870252.pdf
    • http://dianacb.cz/userfiles/file/wikizeteduvugigakiwivete.pdf
    • http://starma.pl/files/file/82290981774.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=6000+to+7000+android+mobile+in+bangladesh
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d399.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 16792 bytes
font_01_sfnt_off0000ebb0.bin
1f79dd72199732a81d1699aea112524df5d8776465e5298c5c235f251156c610
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 11076 bytes
font_02_sfnt_off00010517.bin
b3989052c62321be42df1cde3a99dd404d751cca34545953305ee42be0e1afd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 17600 bytes