Malicious PDF — malware analysis report

Static analysis result for SHA-256 de36ad3260fc8282…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 16:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87774ee64287c9cdf933a574e1c647d7 SHA-1: e229c1a35115bb9e4fbf662fd28c78d8027f16da SHA-256: de36ad3260fc8282457f94c6e4afd2c666dfd7a3d1faeb43b468899f86e89115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The document also includes numerous external links, some pointing to compromised WordPress sites, indicating a potential phishing or content-luring attempt. The presence of JavaScript and external links strongly suggests an attempt to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stjconsulting.it/userfiles/files/80230451457.pdf In PDF document text
    • https://tbsva.org/Upload/files/20210906221311.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/16913270993.pdfIn PDF document text
    • http://lulanjina.net/upload/files/pitijamubi.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/tibimo.pdfIn PDF document text
    • https://5uempat.com/contents/files/sivujekulipamapa.pdfIn PDF document text
    • https://almavilag.hu/files/files/92217174975.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/21026763675.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613416bfe7047---vugubu.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/57098249467.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/1943477106.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/tafutegu.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/navosagegexukiz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b496aa1e53---vumakukevominuberolilobat.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/betuvumajebibesovaxumek.pdfIn PDF document text
    • http://st03.it/userfiles/files/dunevuvivuvuzag.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/45740227377.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevivivugom.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mikijawasoxinonekifami.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/fovudu.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/23974293103.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2e1bbafab3b1ba8f536195f4e1ceb8d3/lavan.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/rofodadavonu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad739e849---danawejonuvudirasem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=picasso+live+tv+apkPDF 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_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 18500 bytes
SHA-256: 708a99ea4791e6688a29f158ed64d48457e288325a9f35ee823b575e2dc04392
font_02_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10324 bytes
SHA-256: 92b7a427bbd429ad652fe9d758c8acadd2c1a05fbeba68be3d1d2b49cc910191

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