Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b83d96e31767a50…

MALICIOUS

PDF

80.8 KB Created: 2021-07-20 02:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d56e7ee289c159e590aa0175cd2ccda8 SHA-1: 1569d2ae17e525e8da9174bc1338a364cb0d6e3f SHA-256: 1b83d96e31767a5081880e1af17f36bee83a2bf141ee083cedce86f3b18e44e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive link farm pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests an attempt to direct users to potentially harmful files disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://intergeored.com/upload/File/89947428403.pdf In PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/7471360539.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/20314492322.pdfIn PDF document text
    • http://etre-belle.su/images/file/farajojovi.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/68119298622.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad836e1e1a6---wawomipilulixebukojareb.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb94edaf1---93221969410.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/ruzam.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59763341556.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jojirukosovalufel.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/zapiwawezafubisud.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/23225899335.pdfIn PDF document text
    • https://parfumzone.ro/files/file/56265231851.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/bazinevaxukujukezaneko.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/51153378122.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8ad0bfa41---sepozika.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xoluduwotivewexidowutos.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bfa4dc6fc96672de946f82a40c8eee9e/36485137497.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1ed951650b867655b53538f3ac7b924a/vadawenotusad.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e16774ee7---sibixepibupimalivodupiza.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/71502834007.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/15372298034.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ud6dldigpji1th68ud6f2p8r93/jorofaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tarnish+meaning+in+englishPDF 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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 10300 bytes
SHA-256: 09dd2597e0ea79fe49f263cab7b93e39612abd3c49bb2196154fca9dd8c90c2f
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 17444 bytes
SHA-256: 03cf4dda9f1bf2d82afc76f738c1804f3da7bd75a6017b1ab7a7ec42a9b0339f

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