Malicious PDF — malware analysis report

Static analysis result for SHA-256 36826fa1cf92da0b…

MALICIOUS

PDF

79.6 KB Created: 2021-06-24 15:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ab8ea60d0e0a3285806014882e750201 SHA-1: 7a31e85edf464e55b02b0fa7226febabcbfd2662 SHA-256: 36826fa1cf92da0b6ed9dffc3fa4ac5ec5394ec9b7ac89235278eb9e6b508b2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd660f811---20057120625.pdf In PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/17365921132.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5d729eff0c8966c7ca6824642329ee95/52937101602.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210615231656.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/025616f5c331bbe5750cbdb382674389/revubobaguluravij.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aebbc9cad---2218229205.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/40756430409.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/61199997450.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/rosazulo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd2c21f01---58399207640.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dcir85fqasq3l13ll8f641aic6/64033093595.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bedodululu.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/23242666454.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/baboralevaxebusijuvopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lcm+and+hcf+problems+for+bank+po+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 5540 bytes
SHA-256: fd65a9d9c1f8f6d39d2055da2dd44ca634717e2c70e76c32c684f05aad2da18d
font_01_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 10572 bytes
SHA-256: b38cf42188afb7c98cfd758454d8dd6f1b5b464e1bebc43696c2b524b3c0d012
font_02_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 5348 bytes
SHA-256: e7452eed75f50f6b8688f77b16bf219805b4ea66ae8ee3b2b7c647aeb5aa12c3