Malicious PDF — malware analysis report

Static analysis result for SHA-256 606d9ad58f6f553a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 18:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91fc054c36baa685592898f56c774814 SHA-1: f375e975031ea080c533c99d50b7da067de30de4 SHA-256: 606d9ad58f6f553a85b3a842f4f512cd3201be40062b9f48369f13a92c19f4dd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chptravel.ir/data/file/73444830636.pdf In PDF document text
    • http://cementfeet.com/userfiles/file/xavudagimirozatobewet.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/88228408223.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c654vdh9a4ld80li41s29o4eb3/badovik.pdfIn PDF document text
    • http://amdind.com/userfiles/file/25726950679.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4irv1c6kusaoktejcumsbksuec/nemanokeretikimasawula.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/68707tqkfj3o34hjsc71vf7o2g/xiwob.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af467d6d586---dusup.pdfIn PDF document text
    • https://magerp.org/upload/files/6709139056.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/27caae58c8ca6ef33dc76e0b4aa29e4b/32377701239.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sv8d26roj6alpm419vci7nc8km/72657924953.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb13d815c8---xurokuravotugep.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tekivokuse.pdfIn PDF document text
    • https://hsse.cl/files/27531243401.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/290f8f9e4c82a278a932da29f141bbf7/negotirogebape.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vesok.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dewokemoxoxivipezidite.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/15777377219.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/botovexuwasenuw.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/zarolopaloveriwebeli.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071308468aa5---3339773225.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/divifededezefus.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/22599809435.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210628024607.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da64c6eacc7---59117834355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hc-sr04+arduino+manualPDF 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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 10624 bytes
SHA-256: 82fc45d892799512665e422a624c67b35e56482e74f6beb2044214bb6167a85f
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 17164 bytes
SHA-256: a19917defc4c5249d59cfb184277ba2cc2383348f7219b47c0806af742bd56e5
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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