Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35f0c5284692603…

MALICIOUS

PDF

63.6 KB Created: 2021-09-06 15:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd681ba21078e4eaf1d36dd06e9400c0 SHA-1: 87e8cf58e7424482887529b54e3cc1044a6d738b SHA-256: d35f0c5284692603db7c35e922ccc85e64da3ead596976a31112037a53163487
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress upload directories, indicating it's designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards techniques used for initial access and potentially client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9212

Heuristics 5

  • 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
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074966b1ca43---27840938356.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/50537411156.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c2a638c2---fubobak.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/nimofokemujulesazima.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160764a1467166---direguw.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gazigeditis.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/mudakagipijenixabudix.pdfIn PDF document text
    • http://edgecs.net/documents/sunemogijupi.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/zokujisogezadatikevoka.pdfIn PDF document text
    • http://intergeored.com/upload/File/beduxisukanan.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/11351939768.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160941616a9d03---15360643308.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/akrl536r5bqahgk5sgv4i580l7/16107966859.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/72822489297.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/bamiwutanaxi.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/rujadulevawejonegirerik.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13300e3005---jesasemomedune.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611184eb129c9---77931066604.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b1c25eaec7f9852c83d1a3ba68a24d95/10142621229.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/def740fc18359782e6d7a7431deb88d6/gapekiwik.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8030af6ca63986f7df1a83e02a5d8c0b/polokuvorane.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/18692078754.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/nusumomatubiduka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=2007+mercedes+benz+ml350+owners+manualPDF 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_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 11228 bytes
SHA-256: fdad8f42f19cdbe09991c5f0d56c44107860ee99ac019fb0b0f2fa5ef54110a2