Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e87c5a18e7fa5f9…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 22:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d734d73ed419706883829a406ddde755 SHA-1: f78e24791799255a0e3e9bf8ecac79a18ea9d379 SHA-256: 7e87c5a18e7fa5f95e580e49063ec7422a15d437b99eacef622c67ededd4e0a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfd9cfd77---jufuzenojimon.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/netojokevubipigukabe.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6778b69fcb---2548240385.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/35898169785.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/resitonivudaraligobudiwa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/87589694618.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tusurovekurul.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sovewabo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9daf32947e---fexejigepiju.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/rapubat.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/2411029438.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xesepuxepakuzap.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/42957746316.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/91835686181.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4a1d77ef---pujam.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3d879202b2fe631f8cb60232f38c81b9/vowurevarutapesivalame.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a15149ab6006b6efba8f8f0b7c4d33ca/574997810.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/16470638660.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/47486627909.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/2483072348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=after+2+movie+streaming+englishPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c0e030dff27abc86de0f1dbb8b02dd1c/nofodaxuromu.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_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 17448 bytes
SHA-256: 61aeffbc09f8e8660e16dfa32ef48676265be93de0b6ce46bb71a4cd23e83f1b
font_01_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 10828 bytes
SHA-256: 66f607284a78627233b333b04fe7495afa83b8376a952e59f9a1c00aa20799e7
font_02_sfnt_off00014df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1