Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f1917b81af6378…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 16:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee86473f07af913da01402cd055c117f SHA-1: 37c5eefd711433900cf6cbc080079ce92436c78c SHA-256: f6f1917b81af6378ac00594a4b603a05c4886994e6a00ed35401906ae18c0069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7304

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=lucky+patcher+guide+2017 PDF link annotation
    • http://ninda.vn/userfiles/files/zepanelekekexumovis.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/64e63e12a54d10901c12fcdd990c58d1/katotaxom.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1db9afd48---19578368816.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145939cc7f93---68228015374.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/divuxifobugisofise.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subibujibimaze.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/pumitenodojovalag.pdfIn PDF document text
    • https://aksusu.com/upload/files/37287368645.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/35007351699.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1cd50347---vupumojidal.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/76055821654.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/4345675184.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/30718206596.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tefusasasatuwi.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/didetolibeku.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/6841650382.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/wapex.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/5179619472.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/70500671198.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210914185016.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/92940694666.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/94627965501.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_3405F2E56424150E.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/zoxusomadawegol.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614090954fd0e---25521880261.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 21852 bytes
SHA-256: 9d7d72035369bfc3f529fe294ce1a0301cd068310d29ba516f9600b23b0609ad
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 10964 bytes
SHA-256: 94c3cc5e4e214067bce14c762660704fbaaf4d8c256532cfcf15ff762afb7799

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