Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d6eb90d77a5a60…

MALICIOUS

PDF

96.0 KB Created: 2021-09-05 02:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d16bc58a6d926ca130b0ebf329525093 SHA-1: 63a541532971c26fbb0f3f84e2207aa0504d1511 SHA-256: 59d6eb90d77a5a6013c98e07c3bd328776e002f19a0f51af6f834d796a0732a6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URI heuristics and compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6463

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 http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8e3e190e06e4a4a4756022382403d5fa/38871402299.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/vabowowuninex.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210719013327.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/67792529857.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a3775bd---46182914130.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/69142910662.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6951400e359956df81ee2c22da6fc147/71962205410.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9afa4968---pozig.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b4222917566c02e682b89b71b2efb999/noxotevolotuw.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/25991821237.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e7b61acbce22685c3592569fa461c516/48706813126.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1b3dd22f1143c566fd1acfdc93a84cac/lupazite.pdfIn PDF document text
    • http://hanifeugur.com/image/files/gowumo.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/kulujonelona.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/43135215725.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/17911470969.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t9mflhtmj4lrejril42ij0vkhp/13836572340.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c700a2a0f4d---18767740435.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d15b4290e---96704412304.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/27835081315.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/75384017800.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/660d3ef46938ee66e0e32dda9409e157/posolalisexupol.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/07/file/zubaser.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/9tcsu7n5be9snvddhg1hlp2b66/15051187643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=polaridad+molecular+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_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 10512 bytes
SHA-256: ffef7384b0061e5e7d9695c66438b28d813165713897d839ab51e493be1865c5
font_02_sfnt_off0001470e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470E 19720 bytes
SHA-256: ead9b39df83941ba494f1fd9dfce26dea9e1b42608483d9e3cd030ad634d8b2b