Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dfe696e3cdfc41…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 15:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ab5435eebc46995585c6d03e3ed089b SHA-1: cdc953735523a45303a4d2e3be1fdf23aefadbcf SHA-256: c5dfe696e3cdfc411603c631f97925a71decd72916845da81bbbda00ca7755fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted from this sample.

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://archism.ru/uplcv?utm_term=forerunner+645+owner%27s+manual PDF link annotation
    • http://papianiarch.it/userfiles/files/9792483455.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/70406488011.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/86855943610.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc6e1f332---93532891035.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/22458966579.pdfIn PDF document text
    • https://abeess.com/userfiles/file/32921096974.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210704_69AE657D93A26C34.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba006b303f---tuwovurawegedivutokaz.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/wigebomipudifewisobeton.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/kubozofa.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jonezeweru.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/17867603244.pdfIn PDF document text
    • http://sparkpro.lv/content/file/42313729313.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02c3f074d---59339259315.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d404cf3ba---liniwogebunupewa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/96f064d28db3b6cfca30156b0d937c53/20557328392.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/37173482974.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/12042735955.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/xiboxizive.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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 17308 bytes
SHA-256: 18edc4cb04599471672ed78e1f867267157e964dad1a63d7662192fc04c875d3
font_01_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10656 bytes
SHA-256: a6500346d8f2a29da849d93f4bc73868995858d29929ca5638f793aa6caa7b5a