Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7bc331e8abd3dc…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 09:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c40161cd91f43605e921ff8382104568 SHA-1: 4cc4677096fcbcd4c194729752195c3d85b941e2 SHA-256: 9d7bc331e8abd3dc8389ca9b220d5066ca591ac78a2575dfa363ab75222d3fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress upload storage, directing users to various PDF files. The presence of multiple external URIs and a link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/83251632817.pdf In PDF document text
    • https://netlandschool.cl/files/47192776780.pdfIn PDF document text
    • https://puntoagricoltura.it/file/gisivuduxudere.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/43322842720.pdfIn PDF document text
    • http://myslizdrave.com/soubory/zonasuvurepo.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/86730491473.pdfIn PDF document text
    • http://qca.ch/userfiles/file/30031738826.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0667413f5e---30241846893.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d877822d595---sojalikiwubolipo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4n3ibpukf1jivg2b2bb4tpmek7/rukemiwelokonanoku.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/zoxozidudurosaj.pdfIn PDF document text
    • http://dalaichau.com/files/daguz.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/xawejesifo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9fda6f7e2ae40739463133dbdd00175a/fodugowogem.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fac893b250a---89660693253.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/geretorupix.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/sepejugunonuf.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/38068384165.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9c436e16647bb1a697d2d4401ac8ca8e/78216911384.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/05c3802b6081a9759a48e171c8458850/78928406614.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb82f98c---16958135632.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/kezotexegarigapujes.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0be8d99f7---59239956426.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/7434734833.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2141fba1b5458c0261aa205c529a3a8e/49829505913.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/84414594530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=convert+degrees+c+to+fPDF 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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 19896 bytes
SHA-256: 5acf982cacd1e88fc5c840155725e6b22d1f6a644915951ce21fb356a795927e
font_01_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10448 bytes
SHA-256: d71e96f5e1607b2a68baed540c54667e227040e55084d8bca982140e89132397

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