Malicious PDF — malware analysis report

Static analysis result for SHA-256 868b023258fe9fbd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 07:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 284d3c84764bbe13a71eae5eaccc7d72 SHA-1: d64225ef6306f5636c75c3526420f5842b570303 SHA-256: 868b023258fe9fbdeea52350ed9173347c436f6ad392c610b6f11d2d1f72f914
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=sultan+full+movie+free+online+watch PDF link annotation
    • http://brilspa.ro/userfiles/file///retuvakekizi.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/13881366035.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161320073bf5d1---7268576974.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/vevasuxozojugofi.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_6F101F62E5E0A87C.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/wogevoniwitujobajumudato.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/6165739999.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c564cbdd8---sopix.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/mujijagunakelifipeg.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ba93cb1645f8c7372ce171217b6a7851/zalidaber.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/komiwososelab.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614419110f2ce---nesidajavenogesa.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/8699369539.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/45845884234.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0e94babc---nikutovameposudepo.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/91633605668.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0b2783ee---55756142637.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109071632139254.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/mubisorobatuvaraju.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/merinenabekerosuv.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/49966381999.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wufotezu.pdfIn PDF document text
    • 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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 10760 bytes
SHA-256: a784fada95a9134a81e48a4a8dac0558e37822eb8df2244eb9972de4dc1ce1ac
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 17280 bytes
SHA-256: 5460d5e5b0dd2fc67ac59a4f1b0f1ab190d033b88119285f5b09ac25f38415f2
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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