Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16279ce7e8bc45b…

MALICIOUS

PDF

85.3 KB Created: 2021-07-09 07:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a70617ee9de0ab1613195567f9a7dc1 SHA-1: 8bf52103f297136b68666ec459822eff2804e3b6 SHA-256: d16279ce7e8bc45ba2cfe36a4098b8f5866954d0e3e2e3216d51cc95297c10dd
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing attack, specifically a lure for recovery secrets or private keys. While no scripts were directly extracted, the presence of numerous URLs, many pointing to compromised or disposable hosting, suggests an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting or scamming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aldara-latinoamerica.com/userfiles/file/38215878036.pdf In PDF document text
    • http://oletrans.sk/editor_uploads/files/98374244167.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c154801283d---bigorejopupofojorap.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fonisewaje.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/julexupepowomej.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zakakazod.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/15598776455.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ddd3389b2c5f50b393fa2aa658d07454/tewuxibetabi.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/8buj8qt659h97ufp0gcq8s84fp/monupedifepexajupigurago.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83c0185d2---11329588999.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d8e32fb42---29335984696.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d50c95fb---86652533508.pdfIn PDF document text
    • https://signika.pl/Upload/file/fokavetemifujolegi.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/59302421874.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/66289257511.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f5a413da25c0ac15b4beb22cfb688d7/kuzilifonodibezekinek.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafd2a61fe---14579820453.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/fupiwogosowutovunawu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/af0f6f38d741239c7265608c4acd4625/fizavenidebetetefa.pdfIn PDF document text
    • http://dienmattroigiatot.com/uploads/files/88859707517.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/banowabupafasefax.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867b28bed6---zojodiwakidazadajaneje.pdfIn PDF document text
    • http://zerosquareonline.com/file/masiruwopakugazenobejur.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ud4tj0ado2tll9l63kkl1mp692/jovoriwep.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6aee381e10---podexu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/pebikikonafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+add+signature+field+to+pdfPDF 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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16492 bytes
SHA-256: 0334def21584229d55d2020e33d88ca2be2b4a340ca2dac494c077eda1cc6e94
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 10852 bytes
SHA-256: cd86f7f133eb33d2561411ebfc3694bfa909d0a6fd115a864217f31dfda11a7e

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