Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e5625cc387f238…

MALICIOUS

PDF

94.1 KB Created: 2021-08-02 17:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f24ceb691026fd0b969ec4d96e107f7 SHA-1: 714acdf67f49cde1fc7c440e81c6d04a174cc699 SHA-256: f3e5625cc387f238239d030073e6b164498c5fcdf14c1e3a0a1c2f0fc80d993c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious files. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9229

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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://hunting.kg/userfiles/file/43170433757.pdf In PDF document text
    • http://duancanhotot.com/upload/files/vusekoz.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f03ef32563e0107cd251edfbacab9c9/21189245311.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/11719a6be1f36e50577a0afc3e8ac8f7/kudotixorumebosedobevu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f30a98f61---46238324626.pdfIn PDF document text
    • https://go2germany.ru/files/file/32382663725.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff2e6693fe---11686646239.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bf92e2748---87210215192.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac453bc12---10030728099.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/15374gmnr395j6qb5umbv8odvp/45177211697.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/88195034335.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/35698521175.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/lumazixoxotunabuvimazawim.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4fa82b83---67579785170.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/94810354467.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/19471019457.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8043b4c4---21206780514.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/miluredinikijemopuzibubi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc846d24d---33066032126.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapojufos.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/97629668337.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5f5254a9f---85849118466.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/23a8f0d9e6d727b9e427c6ae73cf35c0/76834280098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=programul+start+up+nation+conditiiPDF 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_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 18304 bytes
SHA-256: 556621b8643d31aae6141a0dac5f193effd14c7a1b3d22aa1421970c6887b59a
font_01_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4F 10824 bytes
SHA-256: aecc36647ae916c6116cff3dfeaca9c39b332a109125d0ea52a7d9a8c4bde499