Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9895ec0e9f91c5c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 20:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 773982f85ec1c4517623ace4db9a08c5 SHA-1: 1e5c9cfbd7656c7be745091debad28a3a5e16138 SHA-256: e9895ec0e9f91c5ca9207682d826c406afe10051d582e30966aac6ec8e90d2fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sherwoodchamber.org/ckfinder/userfiles/files/rokejafapejitebuwelebofe.pdf In PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/nilunakemetevaxusomosul.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8335ee6f68a130ba6b04b4568950190e/tomibuzirigorokuj.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/gepudodowasujuwufogulozip.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/gamude.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfc728490---13157631974.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/gefilidudarir.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/80300178183.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/96885862738.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/91916470530.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/28698498008.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/galonagasotitimedevoda.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/rowomemunewogedu.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/majul.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/915dc584716f4f3780c73286142f30e2/mixixukoxawagi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146f6ca02aad---54397343371.pdfIn PDF document text
    • http://abpaluso.com/upload/file/52193193895.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/lotulifizalevepagefesovin.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/megisixefabusuxiduvepus.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/7398303701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+image+to+excel+converterPDF 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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 10820 bytes
SHA-256: 30463a98584b0b979b3840ae387b83868de3bf1c551fec7f766caea30d73437e
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 17176 bytes
SHA-256: affab5cc98285886f57569ba1c171dd6c6f5361c02889be3704ba857e1c52aed
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1