Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ee5c6759439e6f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 02:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92715a570510740154b6fa9700d97ff7 SHA-1: 0509fe9dfa5a85b9f58a93a8ad6c24d9f9c7a0bc SHA-256: 56ee5c6759439e6f8bb7b98853f07ac2eface30b34a367d65937e762011694fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common method to evade initial security scans. While no scripts were directly extracted, the presence of numerous external links, some pointing to compromised CMS uploads, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://goodluckfishing.com/ckfinder/userfiles/files/1709261406.pdf In PDF document text
    • http://libron.pl/fckupload/assets/file/70133435413.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc00800c2---80325608444.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/3e7a0f5f40a54fd99d5f08a6e49b3467/76708364588.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pozubeva.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://digireg.ru/upload/mataxaxoxupunoruwaze.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/25a24d9b29b9bc833860b3af0ea3f8a8/33611693921.pdfIn PDF document text
    • https://yellowstonewildlife.com/gozopumazosupepudofekol.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052319380429.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/19622582600.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/cd0b4f05dad4b78bb992901bc0e62f8e/93241905449.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/86115963178.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/40130190388.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/kukikajibu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608469300eecb---felumumokar.pdfIn PDF document text
    • http://ashioke.com/images/library/File/25607319768.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/77123456462.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/67346162480.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098df028902d---zekapumewifibovekabe.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/ruxovogegosovosoku.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/5540930727.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/25880134618.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/wakitar.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090266b3a735---57201199130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=natural+radioactivity+and+artificial+radioactivity+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_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 18104 bytes
SHA-256: 0189e88e0411d5f10c49b118ab074c50c9d2b4b47f53a8d3bd34e2444cbc7301
font_01_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 10568 bytes
SHA-256: 555a8cec473a9a3694280335658782608fe4085e877915e6439e20398afdc590
font_02_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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