Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bc419f78d19853…

MALICIOUS

PDF

67.9 KB Created: 2021-09-08 01:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3acd0a80151f33a9f18e2c3c4cb74be SHA-1: 99894e97d683c0e37b06db6837fee1f9471a1c42 SHA-256: 73bc419f78d19853dd5020fb6d1fe8ee88aa1bead3af1e6e6115fd1089edf572
174 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 an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to exploit users by leading them to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608038694d60c---mefusu.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m5c2cn8r7k059jk25caq0ce9gi/xidibidixopemife.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/16554079207.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pp3s28abti005hc6e33gpg17u4/nutojakagaleji.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/suxegotoledim.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe410aae57---moxomagepafeben.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vb77bb1coqg5a2h4ql84d2gd8k/zezewikededozekolitapipen.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5f61ddcc---vufawutos.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3b3cfc29ff2a30d48a0a76b527d368be/84086734500.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tinozigam.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a96ac689---39761435485.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1e97a757---52770815870.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/614afa2558189138680cb94a796fef8d/xaxezukaduxujito.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/52858870048.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/70836128074.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/41006364541.pdfPDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16117e6348864e---72200268828.pdfIn PDF document text
    • https://penal-garazh.ru/files/77013410012.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/51b8c975511b842538a379e6d5965dd4/gadimolurulebawuwuluboja.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4els0mmooq3cesfhhsff5k0sg0/57377502708.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607592ab3579b---nifaxomoxufosije.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/fafalaforirupugan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=biochemistry+and+clinical+pathology+d+pharmacy+pdfPDF 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_off0000bd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD99 17180 bytes
SHA-256: 3e640d39aa5db2c68f6b6484afb8224c9f2713224f8077177d4a9ddc6b49e8b4
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 11236 bytes
SHA-256: 094b4b3dcbdfe3defd70c22d0854adb5d8b131451df9f239d999102de293196e