Malicious PDF — malware analysis report

Static analysis result for SHA-256 25188f850c22d844…

MALICIOUS

PDF

87.3 KB Created: 2021-07-25 00:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e97b397b2480f6ac74bff141bd009c39 SHA-1: f63187708f5e1428e47771e5a331c0dc453a6ef7 SHA-256: 25188f850c22d84446975d44ec83f82105b66a3ba8f322074fd9794a401c890c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely to lure users into downloading further malicious content or divulging sensitive information. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9215

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 http://humanitool.ru/userfiles/file/maxudixuvone.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8f6aad021---73747672290.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a6a247605b0b5f24c43af56dcd3f69cc/penopen.pdfIn PDF document text
    • https://hse.tw/upload/file/xivixisibedag.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tiwafanelilirago.pdfIn PDF document text
    • http://medi-sen.com/files/files/20433426983.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a3toftdt4bhl19r0qsnrt7c00m/54867336687.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/99076793589.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b3167a2b---46333502710.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b543dbbea---zikawibaruzeg.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/87313834544.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7529b23d557ba82b7c74e005cc7c8564/puguvulop.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a170338eb---jumatagewomekesarabelelul.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f79f94ae31c---mapokuzenutuxebu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a6f674ae0---43978847832.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/semalapokaditiw.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab8a9868d---pilagimovudezunasekexi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c8a2e95a216d6df04cc2ecc4f96b0d21/vufizovujexitakex.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ae2eb2f1---bazigevosoduvipov.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/75687127209.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1956c9fe6d---41468594466.pdfIn PDF document text
    • https://studiorampinelli.com/file/gatebupanoxegidinoji.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27616a771---78663011810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=facebook+logo+2021PDF 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_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 10348 bytes
SHA-256: 6cc5c78d8b471b15993f5427355a65c085105bf5fd01bbe388e211da5904c326
font_01_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 16888 bytes
SHA-256: b0841a26008449ce74ee5293f4953a61935fb58f8855788ec68b9942910eb2f1