Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf59926d153866d…

MALICIOUS

PDF

70.3 KB Created: 2021-07-01 23:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff8e56591da12c42755fe9133056a421 SHA-1: 5883de0abe9e61c18a51ad1f15326dd5e7bbb5ac SHA-256: ecf59926d153866d1c1b4663b6285fe1906ff541c3c87cc9b9d64edad924c2f7
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5279

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 http://royalwedding.jp/images/blog//file/zorakojon.pdf In PDF document text
    • http://ferrogep99.hu/static/media/file/63309739015.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f010ca5b7a---gavulabitaxatalibijuvowif.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/888c499565ba73183b3ce35c76ddcf52/semugenatofuf.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/tajovifimipabokodef.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4d3b567e---moxuziboni.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/tazolivu.pdfIn PDF document text
    • http://fitviewer.de/files/file/34645122307.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/82177196159.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/rixevanigizef.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/dusudosovafelevudep.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5f35cd876516af7ca5f54430f1388e41/ruzejulaviro.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7jpc86fg1l5qq8av9e55ovpaj7/81337149579.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec61aa3c3a---buzat.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/wediranire.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/famuzesamomilakupar.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/86350762070.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/96223573509.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/10660396702.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/458cdd8237eb158842809b37651c7fdc/lekuwajejelufuvufopixazi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-10/20210510085236129897.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pp29vd4fbbhseevmtbo0ftta9l/tegaketinupigefizadi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lln0lqjv4c8d63c98cmfiu6e86/44425482596.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6c42cab1aea393d7fe3b868727d3e832/jikozamivazifusagozame.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/51609503829.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/wobukiwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=1000+pound+life+sistersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 17320 bytes
SHA-256: 5ebce8dfe9aefa115786fc45ff9e21cab58b428193c49abc72c09ed8a2a71b71