Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a6da39cd1792cb…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 23:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a8b31d791d6519bdc44acdafe5852d1b SHA-1: 6008a5aa881ec4b1e4c7be4c0d438cab40ea0ecd SHA-256: d5a6da39cd1792cb9235c5d83782a75832cb956226cad6e76b8eeb7da3c7fe91
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits multiple high-severity heuristics indicating malicious intent, including a fake CAPTCHA lure, a password-protected archive lure, and an MFA lure. The document also functions as a link farm, directing users to various compromised or disposable hosting sites, some of which are associated with WordPress uploads. While no scripts were explicitly extracted, the presence of these lures strongly suggests an attempt to deceive the user into executing a malicious payload or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autoparkalbanese.it/file/9864078168.pdf In PDF document text
    • http://madveras.com/ckfinder/userfiles/files/gagufetu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c16df092b15---91670487780.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072288ac93dd---75063165627.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zuvak.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2810a2bffff9b20388711e7e5542e4b9/33869301576.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/6197378301.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3a1d94b14471bb7a900150d2e1392212/28282079662.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/6361586142.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769337dfcbf---sulilomejitedifijawo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/174f83dea7445eb1413de664924994df/gutelej.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/93871535504.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/40010591759.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41d72754c---morodojasu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/fusarobozi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2ed31fcec94f0c54ef1c629db342df39/rawepenabakevimorazuk.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/36f4c019525bef1b9c0e1f5adefda17f/ravomamitinifekuxojopunej.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1e5jagmo1hv5631avig1s8ia22/86929540422.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e752b757---98703407280.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b6d6b18969db937221e5636af0b77674/2749057461.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/todekowivokirufevekazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+cracked+accounts+listPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bac299f3e45b5c3a796361e70a227c7f/80049440014.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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 17920 bytes
SHA-256: b17aa9817c923eed5600664cdb3888ff2b4d0cc48bc7e27ca263250943b4d661
font_01_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 10652 bytes
SHA-256: 8b59dcc824a2e334b2cef29970ca6e533c0ac5630490fbee2d6b955826e45826

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