Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43c2b1c0ac6f0d1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 06:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3de314defd285e53af29081b690eed72 SHA-1: 780536004f31f5e1d8b86c71b3a5d04de95e1318 SHA-256: a43c2b1c0ac6f0d18a84fd00a57ee016584f6eed075492ea3b7719ac5396cdf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://eurosan.pl/user_images/file/bixos.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161472a2e25336---76572204521.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/26283638542.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/gefijikajatodom.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/81242714095.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/42373223722.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/31249582229.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/xapifawupazevagupojipiji.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/tijunugepuzokibolelamoxa.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109081405265488.pdfIn PDF document text
    • http://cudicio.it/images/file/33266001640.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5aq06c4c9onjc1174jo5tcpjj4/sovemadumelofigafivinaka.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8c4d1607---xutepisabatejasokurorot.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614388103d41e---79213669949.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/xepifefax.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/bekexe.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/66711279530.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/55400157711.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912045620169197.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613442a52b1d5---8374088097.pdfIn PDF document text
    • https://sergiomauri.com/images/file/sasifubu.pdfIn PDF document text
    • https://eetravel.net/file/92566542630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+tv+box+bluetooth+not+workingPDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10764 bytes
SHA-256: 333c37fc8f86395b7e8713565f5c82dad86c307e2c76918e85303018904600be
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16364 bytes
SHA-256: 77af1b00adaa57eabc60ead5fa860bd850ecd01c5668bfb16ea73b6addeb2e4d

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