Malicious PDF — malware analysis report

Static analysis result for SHA-256 20eda5154525e874…

MALICIOUS

PDF

71.4 KB Created: 2021-07-13 20:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d8c49027e51d64ef6803571612d3fdc SHA-1: 6377b72b112a6afcc6b9b69c4455e1e9e7095369 SHA-256: 20eda5154525e874a30d3b76f66305133436c591aa4f847d4e7e671df304f589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm. These links likely lead to malicious content or phishing pages, aiming to exploit users who click them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://wienbildarchiv.com/upload_files/files/12277549794.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a156d5cc---xosogajasip.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a904089fb---61058435985.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c6e679855ff83dc3546fdb79a43e046a/fenubodugisuv.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/sebemopowuxif.pdf
    • http://casaalu.com/luutru/files/garifufajogup.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9f6f915fb8d0b2b20da855b08cad03b9/jesepegijeketik.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/81184e429666e5f5dbc7a84770c18df4/koxebilelakifuse.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ee7336c7---sazenofimivefuwoliwomati.pdf
    • http://seanmore.com/userData/board/file/26159515193.pdf
    • http://anandtouristcorporation.com/uploads/dakurarob.pdf
    • http://barcelonahotel.vn/UpLoadFile/file/natega.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a8681eeb---toburebabigajuxi.pdf
    • http://wooshin.kr/uploaded/file/148801953160a5bff5f3668.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c710f904---4482861777.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/07215cd9acf441a971b98aa09018d004/66755297690.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4fuc2k25cbdumd9ebofobr32m6/jijakop.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5e56e0af2---99042525282.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34bad36a2---25690065330.pdf
    • https://mfdesign.hu/files/file/12632418399.pdf
    • http://denkobarbell.com/_upload/files/62431402873.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=freak+the+mighty+ar+test+answers
    • 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://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_off0000b72c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 16792 bytes
font_01_sfnt_off0000cf43.bin
c836dc8d758f351cc75ae80ec237e7e96582879a41bc9b71975660e752f65fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 10660 bytes
font_02_sfnt_off0000e78a.bin
0b636eb8fb3dc5add36df1f8ca85c4580a8ee5029ba3ed3a6fd37bd398d685f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 15972 bytes