Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb29ec0486e8d58…

MALICIOUS

PDF

74.6 KB Created: 2021-08-05 15:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2e14b28c81f3a40ad93a9c33f0273d9e SHA-1: 2443b3a7c62002ea4dfa7129679065d82c06e6a3 SHA-256: 8fb29ec0486e8d58236a2fa9d863e8f1f88e5bc6c6adb5006dbd9f2ab570caa0
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jodhpurtravels.com/nbloom/fckuploads/file/pufeteter.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b744c541---mejamawugogovomiw.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f9a06985---rafikiwifigedab.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oc432lf1e7a53n8mmprgog65a3/fokodixumafavepawisesos.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kenorelofozilur.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f95331ffa4---73705162030.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/71793960941.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zowewijefufajes.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb6b8a959---54549250034.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbd6c3ab9---zowisovikalegulok.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/balimaf.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mt8adpgmiaos1fj73pf33m4gkr/wedasuri.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805266a22fc---4999903303.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/tivizuvo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17d54951a---zaxoperesorugovixalosowe.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/70024578350.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/berazalutapeten.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b171d8967fc---4421407928.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/zelututezakavapafok.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/jijasejexidojule.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/29222224289.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d5aebf8b0---34909180610.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/48551519741.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609180f2d9eef---58613375638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+much+does+bts+album+cost+in+indiaPDF 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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 16844 bytes
SHA-256: b874ec19ab05dc1c41e844ed7b4c77b52ef5f485fa3bdb56ae49196ebbcbe4b7
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 10852 bytes
SHA-256: 4ac281f0095e323d1d442cce020338eab1411f624c4da89759b033bb41ebbbc6
font_02_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1