Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e1ef25ef4cf225…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 21:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 654480de816c8b7cd2f87f2db05aa1ae SHA-1: a0d2c3a4431f60759fdd90f8416f966e05b87446 SHA-256: 72e1ef25ef4cf225702a548d28ae7654fc571c7fc22dd6b094b7ddea5515ba93
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The document body is unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://dp-engineers.com/admin/userfiles/file/tewifasojuderisiritizu.pdf In PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/74247862786.pdfIn PDF document text
    • https://fong-cai.com/upload/files/56896921069.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160701acad2ba5---kopadukexukeviwewofegasir.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dimaje.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/feninufapufalid.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3dff23a836022d354c864b927fc2611b/87635513289.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/59713846630.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cf667919---kijunenaju.pdfIn PDF document text
    • http://geotersrl.it/file/58932854770.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/19553550439.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xarenajadasapoloba.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb60b43b1---vomiwesalenixajodozizex.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704196aa7d9---dowaselubozipub.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/jowoketirumi.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/biniwivut.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f402cfba4e2---67025602163.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/zobifaletilarezofo.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/33137784453.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/lonapolopagapelezop.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6785a1bb3---8103856748.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/13282582320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=motor+insurance+underwriting+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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 16960 bytes
SHA-256: 2384a6f70eb9d1c5b224b05441c2b6c8e3b4340742b3bf902b1974dec4d26ba9
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 10928 bytes
SHA-256: 8b61da8a51afffbbf937262598d10e7737500b10b9af75d9b9b546621d6acd08

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