Malicious PDF — malware analysis report

Static analysis result for SHA-256 256826d6ab1c2f07…

MALICIOUS

PDF

70.8 KB Created: 2021-06-17 04:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 634b8bbbfd5bc7a20049ae7aad1832d3 SHA-1: 37eb00b316402ddcca44fc649281aebe75780cc1 SHA-256: 256826d6ab1c2f07e5de688ee9b291d5a65f655c83a03054bbada93a0b73c3fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, appears to be a lure related to puzzle instructions, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://huntic.ru/uplcv?utm_term=original+3d+crystal+puzzle+cat+and+kitten+instructions PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aac42b85b18---23921303010.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc81d1582---birejogodowig.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/pukokitamosatepip.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e88e0ec1d---jowazedo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nepolugesajuvojematiduvu.pdfIn PDF document text
    • https://airshow-bg.com/file/8521746694.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2nbgpbgrdncrm7pb64qeq2v5h5/84115950656.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4320d1dc03cabee793a8520c1866ae72/61348393851.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd060da3e9f---poval.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f534f18e---rigasagavirisonojeki.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd61ddeada---zawus.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866994e2e58---24100450222.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609199ce68789---88521650480.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/bd4cbbb6c702fa9fae41c76ef923ef77/5290843309.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ef18a0557fe99102f07df0cb897478f3/13458540455.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/38499545871.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 2972 bytes
SHA-256: d1595469fdee7a142fcc3b5162d3e2ec80492045e3de751de7d35988748be166

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