Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe4381e17b38939…

MALICIOUS

PDF

79.6 KB Created: 2021-08-01 19:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b061b1798498d03d5e2508cdc181c4c SHA-1: baee50b0178dafec14358691d90d74160e104fe4 SHA-256: 1fe4381e17b389390e44a146c11bff070532e5b4ec2f5422d631843447b089dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=exercice+addition+nombres+relatifs+5%C3%A8me+pdf PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m7v9g8v33p0m3pd67bm2jaun7f/betutepokipewadelimoteta.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/tewifadujis.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jakabisotikuzawotorebo.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/dawuzetabeluw.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccb317527---34602751353.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fab590d609f2d1ee17eed882f9138fbe/49298691876.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/dobenutojuxobasigav.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fojikatotimuxudeli.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/27073888801.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ekv43bsgse785u20aqiob48iqv/78131556199.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c26ddd512e8---renijezudusarugoxi.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/jexizowoxonategowo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4d3h0jdrpv5f8erea539ft873/babop.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/58336970343.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfffb16f66---15202585335.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cb85420f---37976804847.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d899593861eb799068a8282287c64514/25569873274.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8djbdij8cd162frbqh13kt23df/pabatilukasujo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d15796336---69384891398.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/80478177489.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aeb67adcc---xinofofogududa.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 17884 bytes
SHA-256: bbec5ca80f439ee152d4e0ad533ba9c3be6cdebbf4a50e3da6d58dbfde188d5b
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 11296 bytes
SHA-256: 3f9d3f55520aee9da4336373ca3d2d105d140955a16b0dd5cf43401c19f2045f

Open this report in the interactive analyzer, or submit your own file for analysis.