Malicious PDF — malware analysis report

Static analysis result for SHA-256 19038b3fccb531b3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 09:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30e58e8e88fdfb0b8ad5ca9fb1891926 SHA-1: c34b2a4df87b88fba9ed278648821f77e4bd1275 SHA-256: 19038b3fccb531b357ecdafac36cd03b98a499967468990f2fa900aca6b67b35
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common phishing tactic. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest the PDF is intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=lithium+epub+reader+ios PDF link annotation
    • https://f2h63c2.ip4secure.net/upload/files/78563493765.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161342687dd9d8---8187979410.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/soparix.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/janat.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/26393332385.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/xejediropowotug.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/bipidow.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wudapazorubegevufawor.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161427bcc7046d---senijaxezovepolidubeno.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/88385081062.pdfIn PDF document text
    • http://jar-ted.pl/file/ferejetugetilisudapun.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/642160e80833de2208675ccbd71ef3d1/66789310271.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/64909035665.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/nalamigokajegu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/musafegosegufifukepa.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/dirofiregevilo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/nopikezugodiwavegitok.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423eb9106a6---tazozilurufup.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/fowapipiritexonerupilo.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/xumalaresur.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/15697071188.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jenovesi.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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 18900 bytes
SHA-256: dffa7077b37b6cdf30740ebbe0ff5c56972436d01f95bfa680a4c6c5a1639ba3
font_01_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA1 10704 bytes
SHA-256: d2d2724cda2e8338c3b1efb911e4591924763e687f091f3cfc9202a80c2d6069

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