Malicious PDF — malware analysis report

Static analysis result for SHA-256 c072215d74a66498…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 15:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9ff4bd9d1237c905f2f286293159fc1 SHA-1: 0d378e00dcb70f9f1008c610121d9b8a904819bb SHA-256: c072215d74a66498d33d23ade9f6f6ceaeff8c42d018d06a529e117b8c1bfd6c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to redirect users through a series of links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abwwilson.com/uploads/files/70833561806.pdf In PDF document text
    • https://serihosting.com/calisma2/files/uploads/nusuk.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/41291878383.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/65496246614.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/76685706347.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/mebumokib.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/39566429853.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/31218386873.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/xodijepabotumexisenulamo.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/64616209744.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/90880017764.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d7e61402883e096915fba3f5ae99d96b/34250551368.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/13005477286.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/belenaxodinatul.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/16102681604.pdfIn PDF document text
    • https://arendic.cl/files/76531717253.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/kewijagaronix.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/24449466959.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/56d03361d085b53cd97d194345bd7f4f/tivikaji.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/87502292932.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/gofajonajovutof.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rijug.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/41q4d171augj0qov2is1rkdlel/34954291184.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/86721572765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cylinder+grinding+machine+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_off0000c445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC445 10824 bytes
SHA-256: 7a3badbf8293fba96d57213863534f06071fabb90b739a23f27360de31781f23
font_01_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16156 bytes
SHA-256: e60afe8205fa0aa3a83bab3c5702e4d14808875f5fffbcf05f1a2446fd26c109