Malicious PDF — malware analysis report

Static analysis result for SHA-256 2111bdbbacfbda8b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d1796cf141b37b9cd5e4c15eceaae40 SHA-1: 43f1258476617ed63422f063d86d05d0412f82f6 SHA-256: 2111bdbbacfbda8b229091d15364c3999b392be25b48a3cd10e2256edb415bf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/98132511dc25b69c78bcb3c7ddce2b11/jowiwaw.pdf In PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/19811394865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0385bdb4---gobifewenuropugu.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/torejenuzuxanuxafijinob.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/genudadikalawada.pdfIn PDF document text
    • https://hot-pol.com/images/file/nunixakivijisijorowiwovi.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/19953869632.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/veserejojuvodaji.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/bujubere.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f8a5429e---36015372237.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nusefezakavibaxe.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/depinalejunajaxurilif.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/nugabobikajesidupoxutow.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/23677848871.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/sujufikolulukixirovisewi.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/68350731711.pdfIn PDF document text
    • https://nyig.com/files/file/19459397497.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/dutabalelerubavof.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/35785395539.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af00797e9---4306667217.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43573501122.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/segew.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/45050303468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+instagram+reels+and+videoPDF 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_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 17816 bytes
SHA-256: dbdc5346be77276cf4d3bfc9276af43ded9dfb875c04795796d6a8fc195469db
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 10744 bytes
SHA-256: a88af3c05191b2401ab8e59aa80e177c1f89e92191e509916b88e0d916ddc07c

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