Malicious PDF — malware analysis report

Static analysis result for SHA-256 40affedc65ea66b7…

MALICIOUS

PDF

88.8 KB Created: 2021-06-19 02:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c48ecfc22b6d869ed2088c107ce02a SHA-1: f564be98efab5e1bf9306456988caa678e074f5e SHA-256: 40affedc65ea66b7c8c621da384965b3a3a5b86feb03f8c0794e0d7e8706ac65
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which host PDF files, suggesting a link farm or download lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions and a password to decrypt a subsequent payload, a common tactic to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://gintaras.cz/userfiles/file/78508030587.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53129953744.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee135da58---56525437856.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6d0b097cf1106d736c4c857d5b39669f/vusofawowatuluwuwafaje.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/e44jqsdl8brtnusj1ju02780cm/xajuruzibaxabusebelugi.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d807fe8a---gedasavidorokopegaku.pdf
    • http://nesthomes.in/userfiles/file/97280925292.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-17/20210617230140460130.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0aaedc375---89472741919.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fe90353d5e0f12e46f21de52dff08e61/regugamuvafimabegikekig.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a51cadc5db984e465f1a3e33823b84bb/mogisotesilapolitudubafan.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97645231275.pdf
    • https://ckd-otto.com/contents//files/10442792912.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ukdd9tngi7jc35a68od79bah00/davemakipuxorafop.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8917ljoj1bs4jquju5cv2oqrh5/97266517474.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844e676292---dodikifesexetuvuvi.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4cd9507c6---luvarutemewefigefezosaban.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=esp+hack+pubg+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010295.bin
2e2ce3dd9dad32089c0be4e9a2de38e629ec7f5a9ee4589d4d3904fef7f303cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 5492 bytes
font_01_sfnt_off00011554.bin
f8735a68f95cd1ff443a90f02346f9f3949cf3d4e7dba2013050e4c16fdc731f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 12916 bytes
font_02_sfnt_off0001408f.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408F 16376 bytes