Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb9a2b311fc1ec3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 02:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6634ef75d65bdbcd4986e42cb329d926 SHA-1: 37ce7ab38071d8ea470c16b2c6e5b70641f633e6 SHA-256: 7fb9a2b311fc1ec36d6c85dfff8a8d12b34b1d3e097b0d29eca874c4549b50b1
124 Risk Score

Malware Insights

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

This PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution intent. The presence of multiple distinct hosts and disposable hosting patterns further supports the malicious nature of these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4722

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://pistant.ru/uplcv?utm_term=bsc+calculus+notes+chapter+6+pdf PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d7db9c834---bulegegikezeku.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160744a87ab841---wefaxaxifefidepamadot.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077205222af6---34322556196.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127e618c9c63---tikivuza.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f708fd0c---xukewiruserazidaxumebixej.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/xuwelotikubedovagon.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69156e8a32---tedawemekozotad.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/92230255586.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ef1572ebfcf896f363210df1c79d1358/48483494333.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7efe96f85---91478933046.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/bewuk.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/1704937047.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/wuxisopakutixobasoro.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/wugobasebufiferutaz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eae079f3f---sovibigedegomifikexekuzi.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/regemovafu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/22608633663c6b4f09c6f87f89e1b828/78388579560.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5eluccclkkkg3ujs54pghe6tc3/lojitigonife.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f4c6fa12c9dd9a1c368b809dd5cc54e4/2673380600.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kavozaluveguvubozab.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/nelapofenunejaveta.pdfIn PDF document text
    • https://mytopics.it/uploads/file/92291767956.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8720615a286e40685c4bb415c8085b9c/30568704663.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/manepedimefe.pdfIn PDF document text
    • 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_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 22584 bytes
SHA-256: 12d54beecdd21b12e992bbf99f787a4732d10fe7ad8e804a9368ea63224db00b
font_01_sfnt_off0001486b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1