Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c36eea2014f6d19…

MALICIOUS

PDF

91.2 KB Created: 2021-08-17 20:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a28d7580305394da7d93f1b34c8e455 SHA-1: bedcd84139dacaf724df389c2c1cf7330cbb2c71 SHA-256: 2c36eea2014f6d19d1c4faee0175b3d7c73a0cf6c04b267346b01964dbff29b4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://oniceh.ru/uplcv?utm_term=test+psychotechnique+ifsi+gratuit+corrig%C3%A9+pdf PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3c1249ce83ace6f4ca437e492e6afd9c/kojad.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/601c2edd3e91042b9b00deccc9e74b47/zuravununagisifenukeni.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/serimatomokewodidebofa.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/33661037821.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62514543542.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9d962ef1---50881570836.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708bfbcca2b---24294888247.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f184dabf538---60979567642.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/kelorerijifigukokeginize.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779aac79bd6---kaludalevifotawamuxepekur.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/lorakozodu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072b973cf9e4---kaxudulibematira.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6fc46f3d---tunakepaja.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16088761a759c6---22238266536.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/41097908693.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/62370612783.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ef88fba3---zesegokifunu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210730045431.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6b0ce1217278932d6c94d3da4adb6c5e/57302164523.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082326b109f9---tuwunebavoti.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e58c781---sixugasurakudosomexexitep.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4439bb958f8205bf2d7a0b04ef3f0929/ripejafazobikadejediwim.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/nefiralesivodot.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/xeviwadoxevubavazevon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 19656 bytes
SHA-256: 1df712f1161e1b6ce82fffb1e955d7d9933fc272fd9b3b158758715d1c06654c
font_02_sfnt_off0001424e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424E 11328 bytes
SHA-256: 283e1568df9221dca6098ee498181cb61f33d2c15665608665d064efe3266e46

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