Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15a1b3adcd837f1…

MALICIOUS

PDF

87.2 KB Created: 2021-07-29 12:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8143d0e5f3cd7634029287d8f3349c9 SHA-1: 15ab52620ba4b386c38c8eb63fbb6ff9789f4eea SHA-256: e15a1b3adcd837f1325f65a82d741ad93ea41ca69ba7710e5501a51a22fbc3c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely designed to redirect users to malicious content or download further payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=what+are+some+biotic+factors+in+the+tundra PDF link annotation
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c09c182c7---94951759234.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/ketagofa.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9c1d4d14bb0ec584256bd940e2a15b12/dixedubegumoxirivulitokip.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/54022842265.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6bbb648c7---zotejivezowofolow.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/laxajobirubegagedawaso.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/munudubopozi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/06fb44839a7ed4e4a6fe7dd3b3e98a15/19770832491.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/24192965927.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9bf8697c0---muzogovujogi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/aa11b8131b6ef6d0be530f47b81dd40b/40501893263.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bipotuzedovajupakuseta.pdfIn PDF document text
    • http://asfalon.com/__files/file/69262154398.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a16a743f---19669058052.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/15009630670.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/winuxugesavujezatixag.pdfIn PDF document text
    • https://parfumzone.ro/files/file/digariletinorekewekewijep.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2a5b16aa0---sotore.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1v9ca9533q6ju328ormo5ng36g/vukakam.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f8634f972151ba402b0752886f28881a/34957634166.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210622_045130.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/63454041083.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/abebbc63714ba62369b00970bb97b5b6/jowuvom.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/90591828099.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/t6bfdd6qs32btr6lld7gj1l158/nexofamo.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16492 bytes
SHA-256: 96bbc4b59861c3061da023010c741a567e6311f3b953fddc1da146b7b4c126f5
font_01_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10928 bytes
SHA-256: 3be327b04a79f81ae7b78dbc2d9c3d958fe02510226ec60f67570dc18285e53f
font_02_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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