Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ca18e310f43a4…

MALICIOUS

PDF

67.6 KB Created: 2021-09-14 18:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba1a0daa445cdf8e35d07c1f6e4d4baa SHA-1: 20f877f5851b8a69fb5a8033675280b4da44ee43 SHA-256: a55ca18e310f43a488b735356ab3060423eba5d2c358abccc64bb8c4226e1007
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking a hidden action trigger.

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 0 text block(s), carries a click-outward action, and is only 67 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 https://catamma.ru/uplcv?utm_term=subway+surfers+houston+mod+apk PDF link annotation
    • https://giritrademark.com/content_files/files/40220722204.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/xapim.pdfIn PDF document text
    • http://oilspecchem.com/files/41340255030.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613caad50bb76---daranonuwavozajodij.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/gunisematezap.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ddb962d61f8105717932ba5cfa0c40b9/dugozizoj.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/99974102326.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/dedekeviselavigibadujenin.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/soluzoxedizeve.pdfIn PDF document text
    • http://sial.pl/galeria/file/95861385059.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11256989031.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/23397324124.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/goxabesido.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/tubipoboka.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevuwisi.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f671351f5e---zenexixagav.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/xelimodagufuwizi.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/filuf.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zugizusuriminewojudumef.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/fukabebebejunekomikom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead9a9147c---82601116344.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/gabokosisewerewefubuxukid.pdfIn PDF document text
    • 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_off0000ad73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD73 13836 bytes
SHA-256: 9ef9b0b3c8ac1c80034b1a831186a2b6a0425e353db192cc72adce61e3fa9165
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 11232 bytes
SHA-256: 01021e32bf86405abb227e5c374398d0e8c8a64de92ae7e146e8c8c03a869674
font_02_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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