Malicious PDF — malware analysis report

Static analysis result for SHA-256 306a8f9d7f943a7f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 18:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d8e739b539ede76a1f90507075a87c9 SHA-1: 0c33f273e32107c07ec7120c4512464f1efa98ea SHA-256: 306a8f9d7f943a7f95a01c687b90bae3499a94e9b192b1d18a8fe20f0f7fb851
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document structure indicates it's an image-based lure designed to trick users into clicking links. These links lead to a farm of URLs hosted on compromised CMS uploads and disposable domains, suggesting a multi-stage attack where the initial PDF serves to redirect the user to a malicious payload download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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.
  • 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://tsyrulnikov.ru/upload/file/1435733396.pdf In PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163155404849.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/jifonanonirida.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/buruvidakatotizuzuve.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31f6d16c---22811150053.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/705065756.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc709e5f19---wogozijenukulipi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631785458.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/81175132997.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/79811099876.pdfIn PDF document text
    • https://togeltop.net/contents/files/91113452434.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/rebavosamubupidadin.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/56790153101.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/puvudakebuku.pdfIn PDF document text
    • https://fong-cai.com/upload/files/14074898779.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/wijifowaseva.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/vaxetanukenipobug.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/zudadepetowivuf.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fazimetiv.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/megupupaxosajit.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613dd502ec711.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/91712259061.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xoweriperosuvas.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zenilumite.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a13b888457---lafelibabe.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/kafezunotaxubaxovuvun.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a287244826---xewuxovefegobedila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+ar+rulerPDF 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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 14076 bytes
SHA-256: 4c924a79db64ebc78ba1440f218f1338cd6ea1a4fd4d1b10214fb66d78c06b71
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10072 bytes
SHA-256: 798f384af7ee0e6098cf156e32602efc271b398f7c0ead1b09536b1cdf017498
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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