Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b435eb0e2eeb4cc…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 13:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0719663e4650ad8bd0888ea4e7db5458 SHA-1: d20e89196d326142d448eaa6550232b12248b199 SHA-256: 3b435eb0e2eeb4cccebc4f10ccd99d7fcfe98faa076695c7af861a51a70a9310
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bdf6aae46a109d5fe873d7c689501d50/73889045751.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/kexiponetepulujuwumet.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c772227ad40---moxawemevorawiwekofago.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/vejavewopusimonulawanuge.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4f06df6d---tadekiwa.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/66793210747.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8ua9ou4kj41ndeamjgnhd0jfpm/konagozepesonu.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/29698757034.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/51938945405.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/xurifipafewirogedesote.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/tijaroxovitowuvesarof.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c9f81fde---pibebigorebojukafavavifu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/tamulipamewuxokizuwip.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a9686c27cd852d4844ca98e7c393c7a6/faboletenomozoje.pdfIn PDF document text
    • http://meskerjager.nl/media/files/gizebukuzomaxijudim.pdfIn PDF document text
    • http://didula.ru/img/file/78843514574.pdfIn PDF document text
    • https://argumentua.com/i/file/16380097439.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc51ed48d---tanizuxukopole.pdfIn PDF document text
    • http://novichiha.ru/pic/file/67923839300.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/97876622807.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d955ae9a6af---28667919361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=idioms+and+phrases+with+examples+pdf+downloadPDF 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_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 17704 bytes
SHA-256: 5382b24d667e586fe8cd9465b2665e85e7ef3306450a681796eb1d222e5db0ea
font_01_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BC 10900 bytes
SHA-256: 9e207cee8ced646e3f44b938b5c0b51117353eaecd35c81f09504f97c2c65058

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