Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc2d6a16c7eec98…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 19:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 513ebca2379e4dee10ad48aa3f71db73 SHA-1: 4f0429c025699ec31b77fcfef7aaaba0fb77f195 SHA-256: 8cc2d6a16c7eec98ed8da757341dfd0fb5d13fba6c6115fb11261fef48d2109a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ea318efa3326ed7213764b3dac3bdfde/totinelafapagefebe.pdf In PDF document text
    • http://sterenstein.ru/userfiles/file/muleleforipuvenuto.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d9b6c9b7---zizalalebitoxuxibipavonol.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/sutuje.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/37712389737.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/satejav.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/jemidajelexilojevapo.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/13515105964.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210919010051.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/64488395316.pdfIn PDF document text
    • http://arsvet.ru/img/upload/18798219228.pdfIn PDF document text
    • http://wawa757.com/uploads/files/2743211254.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/luwijixosipalilapoxazopow.pdfIn PDF document text
    • https://somogyplusz.hu/files/dipalejomodezasamigikajix.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa9dbedc3---tibowonib.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/nopunuzupejexitubese.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/watepumivaforev.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/15144733870.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/soriwepazewedunibex.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/mugoduguvewero.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/51944353994.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/zagosabidedisi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/o7ou5n2gr4vd2kge2utau79ng0/libotirigosokavenep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vidmate+app+new+version+2020PDF 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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10872 bytes
SHA-256: fb3bfb2739c90611a1a1731afac9a7b615b9a99960392c8faa45cfc505dc4cef
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 17840 bytes
SHA-256: 72338a48b414b291aea394a9c84929bc55fd73f8d0fc1e8a6a4588816b80a9ae

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