Malicious PDF — malware analysis report

Static analysis result for SHA-256 8902f63f2261d976…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 19:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f46b3fe081f818a1949cdc1b1a37f19 SHA-1: a79dbba56e49643ebb4390bee630a85bc9bac5b2 SHA-256: 8902f63f2261d9765ce3fceee520b87b38258342b4def371a55cbe372887ce4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-based screenshot and a clickable action. It contains a large number of external links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a likely attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 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.
  • 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://solyaris.pro/admin/ckfinder/userfiles/files/89154720773.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bfb4e8153ae734e04355e03c9c893fdc/1241487909.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161486e3f5c2be---rupilibutupejosepoliwepi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1a488cac---34710973558.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/25669607891.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614505a62d9f1---runesifivewexik.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jeresowivodin.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/88145905502.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/56284913507.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/60781997205.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/silawugi.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/47771131924.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/womukifesodu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/42640632813.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/topaxiwesesusuzebik.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/89049254482.pdfIn PDF document text
    • http://ctm.it/userfiles/file/xudemuxus.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630780010.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138741c25eee---4847027094.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/kuzarijemujiwaxixosudifol.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/sezuwawu.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/luduvemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=catch+more+flies+with+honeyPDF 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_off0000ae3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3B 10832 bytes
SHA-256: 4c21d41eb513e2adbf9ac97ce05c76b1f54b2ed25e06ccdc477511fad7fe225d
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 14488 bytes
SHA-256: 5ec7b4cd27cece27cca2a856a6481e5ba8a434c1d08deb849f34886d54daddcd
font_02_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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