Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f579c8ac0432558…

MALICIOUS

PDF

104.0 KB Created: 2021-09-05 13:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca2859329a3aa0547eb95bfed1d9dcc8 SHA-1: fe57ffa5cc36d7e4c30592ca5ba73a4dfb085dc4 SHA-256: 9f579c8ac04325587dfefddd8f939ed487ac7db6b0b345ec9765692084da20e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a distribution point for further malicious activity, such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7085

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/49ae3e66b7e9955657376440614573f8/masejizesu.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f3f0dd9a---51191998810.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e14aa114f29cea3b590350ad7fee8c3e/xenotalipizilegegixixiz.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/towekigiforosado.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442f7ec345---83133685168.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/49333146019.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cogdcso6lo1j0v49t4igo9krr7/994342627.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gsbfi9qvfno6e6ivpb5hh6pn15/jorato.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d9ecce2efc288754001f8f96313a3fd7/dizutomixibazav.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/53688929200.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/93777884963.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/duvedofaxivuwezeferevuj.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/10132422551.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/47386352972.pdfIn PDF document text
    • https://onlinendttraining.com/files/nisodererojumodekizu.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/93187562365.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/8177839849.pdfIn PDF document text
    • http://freeski.hu/freeski/file/21860802348.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/zogatinavipug.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073f61fcc0c6---22015754590.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093e99b18354---17114749891.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/44211402358.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/siduwagakuzujejazafaxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=labour+law+definition+pdfPDF link annotation
    • 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_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 10604 bytes
SHA-256: a875e68f0f4e6da5372bfed9d296dd3d9cdb13e6de4637ba59a34871d118a205
font_01_sfnt_off000153e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF4 18588 bytes
SHA-256: 315a5b1e6c8d151eaa6e5019a3eaab1c439d0dd2a24da27be48298e8a336d81e