Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bb3b99fbd934e4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 07:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63dfd1bd0cb7dc6e383386f949f79aff SHA-1: ce5101dc4c917f84b315d369967013d2c72e1b0b SHA-256: b7bb3b99fbd934e4e40e558674cb0b0d12eea4b0471f38102730d17bd70a6ee1
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, which are commonly used to distribute phishing content or malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious destinations.

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 https://foundryindia.org/userfiles/file/xomikemalanepafadij.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ce9d5bd---xabimo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e6d392399---kapedotodo.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/2591474853.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c3a7aa22dda65325d5aa2b67634a328a/gimagilukafipamedewi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/viviburago.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4qg8tcgmt3gf182s658b6lgcgc/86520160194.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/25966359031.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/496d7cfb170471014ee29a959ad85c56/33449818810.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/57440579323.pdfIn PDF document text
    • http://laduses.nl/image/file/wunusedukiduwo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c32dd4f20ebeea899056658e236e301/pijarasikedegezaxofog.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/52092985304.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/0048c1c9e886ce76ff97ef438ede4cb4/poruwu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160947fb2e3cdb---wevewedutalaz.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/dozukazepebuxasiki.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nadid.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a1fe9944---98366965633.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/konedafilivenekubafi.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/titamimadikedipew.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/20126993165.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/35455961405.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3007b4bc9---lumilogexezedo.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/river.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=induction+for+gestational+diabetesPDF 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_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 17016 bytes
SHA-256: 4bc84d85cfb929ad5183ed4445a9a2a99e7bc196d7f0984982bb3c0db0d8e778
font_02_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 10844 bytes
SHA-256: 9130ef39bf937e80b4e09e8a658f9ce6ca67dd94bd9d7c4ba14d00c3af18db70

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