Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d17edf1520ea38…

MALICIOUS

PDF

66.5 KB Created: 2021-08-19 04:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e5bb36e91a2b25505686556fd03ead8 SHA-1: d7ccadcf524740b88ae7a89b5105cc07ea62bd20 SHA-256: 78d17edf1520ea381cc7baef03dae4982aa1ee414d71ea7e335d5ee1672ee854
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised CMS uploads, with many distinct hosts and UTM term redirectors, suggesting a phishing or malware distribution scheme. Although no executable scripts were found, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9392

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ff2aad6a---44412327771.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3f1ca347---dokoxerunabi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zupidurulewoma.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730208a1a66---sekipovalitamezikaw.pdfIn PDF document text
    • http://teakdeck.pl/files/file/81501675701.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160813a8c9fb9b---xatinun.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/30240395512.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/531870255.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/13773909666.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ea06e5b8b56805a7b912bd5cd544ddd3/lusalabaluvij.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/jebemexavuto.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608298cf8d732---51767336242.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/verutitiwudaxidesadobev.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/rifigopokipuvojolikupap.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/sajatew.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/potafuluvagatila.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e823a91e341240044a989b494c17e78/faxijivifebosuxuk.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f16027c0f9e---73581336532.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f9369af1122e250aa5fb3c1030e5e9a8/fetazenizer.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/15459715738.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/16217687487.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210605192449.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/346464f7cb497cda89afa1b27110f134/53638705207.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6d252ff756fe990fb21a69f9cbbdaebf/66711691935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+repair+samsung+washing+machine+error+code+sudPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 11092 bytes
SHA-256: 87ea39b02eff89dbd5ef14163d675531d3bca26d5409effc6a1844227d119a6c