Malicious PDF — malware analysis report

Static analysis result for SHA-256 a044951a6641ed5c…

MALICIOUS

PDF

70.3 KB Created: 2021-06-06 12:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0be8ca5fe7c323f73af0ff475a1d5d3f SHA-1: f20d6fb84a85cfda9a16478de8d7666eaecc881e SHA-256: a044951a6641ed5cd94a28416c6d1e0ba1c70c4d26dd37a10d71d1ce0bf3296c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=diferencia+entre+verbo+transitivo+e+intransitivo+ejemplos PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec67a624a1---39591922918.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/42913662681.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0pvhsc1fukfer8v67ipt7v36pr/mopugezakukivalefopum.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5a083bd558475484e2eea937d1f3164f/werego.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6d783b8e0552943c3189f0d9c7f6e4c3/zozigezumiwojedepugaren.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/oubardg7dp6p8spddvsqholn0g/tuzofijinuxode.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/lefamixej.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160913a946eadc---diwano.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/nepejipiwavenix.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071411163cce---46699739874.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/leaj0oqg4mplo9isvl4oljfm15/bizuzofugobijana.pdfIn PDF document text
    • https://majubesar.info/contents//files/46289577621.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qufnk7jm2c9b7d3ph8fusr73te/35603937919.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wolovudufajolojafukorolu.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/zinivoxezedaxajeb.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160948f6e6bcc8---83763242378.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebabe646f5---zenumokozeguriwekatof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5436 bytes
SHA-256: d6ac12892bc4ec9b3b7bf25b4834bc8e1830000ff5aa31ae02ee3c8fca38d453
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 11220 bytes
SHA-256: 0a2d5d5cbf745e6aa7d819f63283860a196e438f93e2484bcb02652ec5a52c60

Open this report in the interactive analyzer, or submit your own file for analysis.