Malicious PDF — malware analysis report

Static analysis result for SHA-256 20af00d08207bdec…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 05:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25ecfb358ac09d2ba85a998e5d80c617 SHA-1: eb623ce089f6f3de324541df518185d37b8079a9 SHA-256: 20af00d08207bdec7f219e2798597e75079c2364fcedbd4452ec2ad8e3901e70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into downloading or interacting with malicious links, likely disguised as an invoice or guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://mamsn.com/upload/75213888561.pdf In PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/37974370356.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/od99v7hstv4qltoaa8n0gg4kp3/pimezetelegaw.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7f9760eb---potiguzosiwawuzekaxe.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16115c24f02ebb---zodogusaxojijejom.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kibojukozokesolet.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/veguji.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/93402776425.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd18de266a6---lokujidotisivu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9673760d---wugubarereregijigo.pdfIn PDF document text
    • https://uangraja.com/contents//files/purumetok.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528173134.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429195137140.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d88cbbff4---14607388509.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6f927dd50fcdfecc5333975b440ffced/96768380960.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a856b21f8d4---36771428425.pdfIn PDF document text
    • http://skupka54.ru/upload/m/xilidaxopale.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945338d5138---puxuvul.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8427804403.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0411941bdb---tuvuzinikuwavelake.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210812_D3ED913C5AD01AF2.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/nonenariwuga.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd9ddafbec28177dfdbe21352b6b74ea/27907253291.pdfIn PDF document text
    • http://pactolous.hu/upload/file/80369492434.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/007ade1b63e895848f97657c09603358/taritedamumisasedibedoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tally+erp+9+gst+guide+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_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 18060 bytes
SHA-256: 313169cc8e732a912760179b04eda565b4844938603c69cf4e20a1e1e3cba73e
font_01_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 10792 bytes
SHA-256: 74e54e88abca29e5c4669a423ec1ba74b867d1b2deefa76d37e623ba2c9a7a4c
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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