Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d8925f2d444b6d…

MALICIOUS

PDF

88.2 KB Created: 2021-08-02 06:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 722509150b2a7ab1b806cba2b08e6e78 SHA-1: bfc18103a93852768ea546fac0e23d7e790bd6ec SHA-256: 42d8925f2d444b6da4ef623f3f11ff692ff43198db30f59db6cf8a8bbcda928c
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits multiple high-risk heuristics indicating malicious intent, including a fake CAPTCHA lure, a password-protected archive lure, and an MFA harvesting lure. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggests a phishing or malware distribution campaign. While no scripts were directly extracted, the overall structure and heuristics point towards a multi-stage attack designed to deceive the user into executing a malicious payload or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 9

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=employment+bank+6th+list+pdf+download PDF link annotation
    • http://duonglaohanoi.com/userfiles/file/54515806684.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4ca21afa21bbf258d3d1595c46544d95/sirajekajagilo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160acd04158e3c---36977391299.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/40601062242.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210630085351119.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/20q0ohubscl17ei8050uck2pte/95270629992.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ruguz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ad81aa8b18e593625f8b802f07005ebc/negosinirexal.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e07969c16a---pejusa.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16249558791332523751.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0113766337---xifomekobezepogojoruz.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/212a4b0afe2860541e8b24af9a56e011/lelimatuvokan.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/62788488472.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/63830456126.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/72c612097ca70bee125eb427fa8fb405/23515647837.pdfIn PDF document text
    • https://plasy.com/uploads/file/78630722576.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d675b3eb2---nawavinume.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/56116194364.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mhinavi0igoqccasi41nphhpu5/40167805901.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753436c28bd---gamudojigujit.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d83867e4---jufitelelisepewa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bi47nq6gccsn48074fvtpk4f9m/34476176211.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_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 17136 bytes
SHA-256: b3c58aa366b3a797573c4f9240fea345d7afaa31a210cd9af74f2d46383db3ed
font_02_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 11244 bytes
SHA-256: 795f0a5efb643af2eaaf9f03f80464e42dc8d369dc10da5fbd84429f17e4dc89

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