Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b776783d794ceba…

MALICIOUS

PDF

88.6 KB Created: 2021-08-17 11:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7a2a304c906c3e97ce141e547c2b3327 SHA-1: f2266ded6121763c7e20f28e20169b841ccc19ac SHA-256: 0b776783d794ceba5df2254fa487dc1cce35016d83913958eaebf4e6ebd1563b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bjhtdszdh.com/v15/Upload/file/20217281145415679.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20088b75e---monewidufepabirofopolekir.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210723_16BB3FB7DE540F58.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1a870abd8---14817478065.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/pigalunop.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160715f92bbfd8---18626492883.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/xevipuzulonunivajatiro.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fdf4df937---wijepoxixexasigivezaxes.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/osomphmd2ev7ftjp56ll2v6j7i/wusanon.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lewameranobisolopen.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b01508ed030---24340053936.pdfIn PDF document text
    • https://grouptm2.com/contents//files/wisada.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/62155713976.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d1f89270e30644e570683ce665f40655/barinetigovafimetaxex.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb538e1b66---pipopajado.pdfIn PDF document text
    • http://artospace.com/pics/file/61118552360.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5955de3ec---vemuzanerojipepodo.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/texafiramaridotik.pdfIn PDF document text
    • https://drsaman.com/files/kefuselatojopapolez.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nisoposonibiniwajedu.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/kuwam.pdfIn PDF document text
    • http://standardamulet.com/files/files/gatoxafugijunexibonab.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lenanubadowisiv.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/16386524591.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/edde7b82ddf6f5217ec74bfeed4f496f/71854347935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kuta+software+infinite+algebra+1+dividing+polynomials+worksheet+answersPDF 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_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 19052 bytes
SHA-256: 63e9f3b61bc54191b5f47c1495429f169731fc2fa86c983e6a85cf75dc65e5a6
font_01_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 11584 bytes
SHA-256: 5671e73bf2a03c2964afad185006db19df0d12a6ef2114bf4e329c2eed47386b
font_02_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1