Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a1d5c7dd26722…

MALICIOUS

PDF

102.7 KB Created: 2021-06-25 23:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e9838b79e2c3e97b0b23f96a6114fe8f SHA-1: c7dae905acee59c8944f4b4da4d394003844d1ce SHA-256: 7b5a1d5c7dd2672233effe4c238f46c0a092152725e2a3284ad0815311b28c13
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress upload directories, each hosting another PDF. This suggests a phishing or redirection campaign aiming to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d445cecf555---wimemijilufib.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c30e3a63---ganizepitik.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/9803652777.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210604_2D794F3669E6643E.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/jixup.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e5b27d09---16253970679.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab364d738---gipidujeboxuvazi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e52e31e59da47d033bf7bce6fe7a6c49/78539096461.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/junitomisibigalefufona.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096170fbbb0b---zokomufazo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27ef2ccb56---kotokazasenozobopavik.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac91bf291---91326310127.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ktatlona2k9tirf70rg2v81nn4/gogupexogilujemenow.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cee4999a---zasanuderejunig.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/zisaxagobosanowe.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/97368159858.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/49753959129.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd7f0fed2---butemugofalavowuvikexared.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/45427474108.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/tewizilusodak.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/79050534228.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f92ead307---samevofojuvodukalexoxo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f936251741c5420ef9f2317ff5a1894c/zajavafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=variety+principle+of+designPDF link annotation
    • 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_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A0 16756 bytes
SHA-256: 3218ae9ae19cf5c8d6611d78043436ed28bbb52d03e7542f184565e1f19348a5
font_02_sfnt_off00017444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17444 10880 bytes
SHA-256: 1738bb867fb57455d6859ebb367b31b84342c049c7537c789805ffe81c9b6574