Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17f8f80836aa01b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 17:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15d2a2050776925c03c47515d0eba3b8 SHA-1: a7668b009460e8cabfaac5e9092079b959d8e952 SHA-256: f17f8f80836aa01b439fac6720949196c94db97ef63e8b6dd582aa1c4e2c675f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 https://coretry.ru/uplcv?utm_term=shadow+fight+2+hack+download+android
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210921_C9537386EABB78D4.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/3690577329.pdf
    • https://tttinox.com/upload/userfiles/files/50375223329.pdf
    • https://autohausnschmidt.de/userfiles/file/gowebigoveled.pdf
    • http://risorsaterra.it/userfiles/files/tukifutasimaludurupidap.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/38635873692.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/vesojaxakuxeru.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kf5ooqc46v41fo2km50vr3flne/konexigumoduvaleta.pdf
    • http://automotiveenergy.cz/userfiles/file/7344138599.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/wasozeragavaragodubuzuku.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/fagajavetafodukibotexozos.pdf
    • http://www.gamylai.vn/uploads/files/53857166418.pdf
    • https://maisonforville.be/documents/file/8653506997.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/wetemape.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6c0447a741e8883adf3c24704b511646/84305736250.pdf
    • https://etcbt.com/userfiles/file/ruvukorisurijafetavibab.pdf
    • http://www.uds-myanmar.com/image/upload/File/boletewegoludabikabasi.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/30581159955.pdf
    • http://sangjeom.com/userfiles/file///17898551101.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5a49b79fa---lavufimu.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6d2ead1c7da43efc8df95a767b2dd5e/ginenadifajobibaw.pdf
    • http://hytechcommunications.com/userfiles/file/tixudililojevarabugisa.pdf
    • http://zjqzzx.com/uploadfile/file/2021090309482473499.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/8583988280.pdf
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/podizuzilagipadonevano.pdf
    • 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_off0000b576.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB576 16792 bytes
font_01_sfnt_off0000cd8d.bin
82c73ed5eff6a88238131d7ad0ff9220ea631a4c1695a20c9baa20614b81732d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 10828 bytes
font_02_sfnt_off0000e65f.bin
7e37cc76b3770b50896d95bbb3d37eb1f4bed9542cb6127a132066380e6a2a46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 16168 bytes