Malicious PDF — malware analysis report

Static analysis result for SHA-256 b124e7148d4cac7a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 20:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3462d2857644077d8bf88bd9442c8c3 SHA-1: d2c2d93b048c23e77a9bf3ed90b37d6a8df79554 SHA-256: b124e7148d4cac7ab3020258c012bd6c5778bd728c8b43b6e9ec3ef316147e5d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The embedded JavaScript and social engineering prompts, which instruct the user to disable security software and execute commands, strongly suggest an attempt to download and execute a secondary payload. The presence of numerous links to compromised WordPress sites further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca8551d86ccf3d16b3aa36b453426718/26243454041.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160701906789c8---75916985131.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/sibvuehr6gth6scg6pe2olcmof/75629331216.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/44805459325.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/nalagodizirap.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0880b8b89---57446310499.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a20a29518---61493142982.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2afd12a0e0165bd434ba65655682a055/78156642018.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/af2787e2cfc382c3e5b0f6c1e85c0f85/xemafogafalijalofuw.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tarub.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/93752641837.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/79336299335.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/22546305434.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/91914293813.pdfIn PDF document text
    • https://aedwea.com/upload/foto/natirokurevemefo.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/79736264839.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/81053815318.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/poxelumilofofel.pdfIn PDF document text
    • http://fullx.net/files/zusab.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jeginonakaxegixetimajam.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/feralaxul.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070cedac6f81---71219693367.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/kadopuwovaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=there+was+problem+sending+command+to+the+programPDF 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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 11152 bytes
SHA-256: fd2bcb0adf5c368d50c920c5e20c3a405494ab7626d6a3bf339764b6ad7c61d3
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 18348 bytes
SHA-256: 7791652b7625f5a0d319537f6d9089c88a399866e870b77ef818760f92d66b9c

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