Malicious PDF — malware analysis report

Static analysis result for SHA-256 662792b6750dd0eb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 08:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0d994a99f76bdc967f102bec459e192 SHA-1: b7f9e9b808625399e682b1d58ce9de13bf00ee1e SHA-256: 662792b6750dd0eb6ea3667aa2449037ded2a27e42073bb4f95b2c0591070706
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories and disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pojaguf.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63f1ae91f---puwelifawogawatav.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16309797315607.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13def307d---kinaxemige.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905102543946.pdfIn PDF document text
    • http://skisun.it/userfiles/files/81284494734.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/wugojapiwozevaxuronemiwez.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/medozebofugusevigimusa.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/jotagese.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/78815307261.pdfIn PDF document text
    • http://centronegozi.com/public/pesipinabetesoxatilowoze.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/10074708487.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/52000711278.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/5124464100.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/70693035634.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jogepobikabewosi.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/73164744181.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f137a8224c---7726239283.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/nititizaxamivazefojafalop.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zudakejewezituxatu.pdfIn PDF document text
    • http://bankerz.in/qpic/files/pugefakosidudinudiru.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jubutesugeluzonejefir.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/sidina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=business+research+methods+exam+questions+and+answers+pdfPDF 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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 11324 bytes
SHA-256: 6fde134baaf726981fb2d24ecd1050ff01fdacde2f3bc55049afe9699a607ac5
font_02_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 18588 bytes
SHA-256: 4d30873ec684a0297af4e6fa29fdd15bbcbadfc9a2d1eed885c9fd7e17e47d53

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