Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5bcde561b637cb…

MALICIOUS

PDF

97.3 KB Created: 2021-10-05 03:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9efef57cc3f6333faefb515a177854e7 SHA-1: 83e0ed9ee9d65fa82b52c6ccd3df073f7a8c7f27 SHA-256: 8d5bcde561b637cb336fcdc6fb9b3623b93bb697912f87bc0214e96185c6f1ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://vivaldiskibus.com/FileData/ckfinder/files/20210929_A8B3BC58E091792D.pdf In PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/54165301343.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/wavirifexiketiz.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3883dd92---fajepijumo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210929184956.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa562327bd---26719711519.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/vuxuji.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/7950154184.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/47930996885.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202110050719363289.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/xekarumonisijegovirukotip.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/rasumetobenaf.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20211003144925_vexnfg.pdfIn PDF document text
    • http://promenade-perpignan.com/userfiles/file/digutok.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/34598041296.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/nanilawoxixegeme.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/logumugalivu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c90eedcc0---70622312751.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/wavikofusiviboluze.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd816935c---21591193544.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xeruxewatigikesugumipuk.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bofuzinolip.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/50914904484.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/45405836732.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/pumim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+seagull+monologuePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 10328 bytes
SHA-256: 2b93b6a97d4fe1542422e0463377c19e97d2922c5540007e9b1b7da7ba383fbb
font_01_sfnt_off00012e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 19512 bytes
SHA-256: afa283d8a0b1fff13fb2d86b4d17f3afb7da1be25ce5503d39a0ca8302e8187f
font_02_sfnt_off00015fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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