Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7ce0a5cfcef98f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 21:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ff992a92b90a005f11f07b479678726 SHA-1: 1937c650ec8330c9b15d7a29208c6772c3782430 SHA-256: ba7ce0a5cfcef98f7a2bfd3c9b6e2dffe11045fad46bc7aa360717ddc9f0b375
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains. Several of these URLs lead to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://marwaautorepair.com/nbloom/fckuploads/file/10460020900.pdf In PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/verotu.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/25117260770.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/11849681455.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/pekesifizukewiko.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/lijetusuvusejozoromiji.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161404ea924410---detiwusatolefuzovubevotir.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xopapabusukefani.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/61637277301.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/61879464016.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/poropajunulubove.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6792c22a---51336989991.pdfIn PDF document text
    • http://workontext.ru/media/file/2779607281.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7af4d2ef7b18d338e22c62adc182a569/26366272378.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf38993ff---92028990262.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/razavewikabobejeledudo.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/88546904526.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dkrpt6e36prf1dj3cubgebrksn/luweregatajije.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/82864024896.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f053736715---juzowibaraweliki.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f1c51394---14868647096.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2t3iuoi6gs3h3aqjqlfde946j3/walana.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/65675419865.pdfIn PDF document text
    • https://baglab.pl/galeria/file/7245310051.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cheat+wot+blitzPDF 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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10148 bytes
SHA-256: 22c072ef4fe0b8dd96f45588f8dbd6f24f5a7b1e157e5fb20f4545a69af44164
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 18832 bytes
SHA-256: 8fde69e8ca3d0117ce8fe3f8458722a4cd3884e0e3016cd77442e34eb3be73f2

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