Malicious PDF — malware analysis report

Static analysis result for SHA-256 252bea6a89f6aeb9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 13:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cf85f0245440d877bd1513dc23e8e13 SHA-1: 9296fd4451fa0cdbb35e373b6adb3f3285645573 SHA-256: 252bea6a89f6aeb98a646da4ccf5c071763d09802fe72d981c7aa097b33674fe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a high density of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be a screenshot lure, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://northcity.rs/slike/files/popupinenadagas.pdf In PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/bogozeledepivix.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210903120340799773rsom1c.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/528f82d0ad51c2f205e67b752cfae864/ridanavur.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/pogoga.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/35020040297.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/86492290312.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/botimarudunugige.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvorogesogo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kos11hk0lnj2oh6opigmpc3160/zuduvejinawadoz.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/9425160520.pdfIn PDF document text
    • http://geodez.com/pliki/file/13602071836.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/68191807143.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613367cac01f3---ponofutukedulebe.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/foxazapezatajov.pdfIn PDF document text
    • https://trystsalonri.com/images/file/82358481068.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/54749133875.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/kozunoj.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/kogote.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/negarup.pdfIn PDF document text
    • https://europartner2.pl/uploads/27385820580.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380b5c39f7---fowizipivizumenilavunu.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///74687695386.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/zunonawixofovedevupode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sans+undertale+fight+simulatorPDF 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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 10976 bytes
SHA-256: 1ab9144bfc90607821878cb867a7264073599e0c6f1f2b8aa7d9e9447d99fa65
font_01_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 14344 bytes
SHA-256: a5447c1e54389c885e9e620e9ce1c5dbb47c010ac889b1aa5eace28e5e1c7047
font_02_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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