Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddfcb97fd05ed2e…

MALICIOUS

PDF

88.8 KB Created: 2021-08-27 16:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d9486d8b99b9c49f675da7e5717f11f SHA-1: 119f1e11952993260a310064adfcf75b528a1db6 SHA-256: 1ddfcb97fd05ed2e53a3ed146b8181340dc5ed8bb25ca1a9c19d10c98b14985b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to these external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://akcjonariusz.com/UserFiles/file/42502130671.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340c030a7f---38877361177.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/8349146629.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbc657f0b---maluzubusakeser.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/levijozalegusajiva.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/92993521748.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/59458584260.pdfIn PDF document text
    • http://letdentalab.com/img/files/sasepuketosevazadotopot.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/116a424fe712769fca07570d7a3452ab/59082839427.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16091785ac0950---xulexupuxenisufonuxonan.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vukjufrprdgtlq2brtr7lscnas/19581801508.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/29463731932.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/58673412744.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357f686af8---bilititaretutemo.pdfIn PDF document text
    • https://educhina.mn/editor/files/46703493787.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/82690789655.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516195048692553.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ad10eb5ed3e5121b94fd28ae72aa925f/81658209016.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/kunuzepidota.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/nejorovanupikularagejiso.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/motebineliwekuvab.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb686a3e9---juzon.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/lutanikikesorojebab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=animals+dying+from+plasticPDF 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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10928 bytes
SHA-256: d19d311a3c1f10ae1b4074af07962e4410dfb88dee3677cce644d87a239081b1
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 18132 bytes
SHA-256: 65137b8f08fa15f2fadd51914b24951f3cf3bd311b290e16e2e1b1b9fd92954e
font_02_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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