Malicious PDF — malware analysis report

Static analysis result for SHA-256 202a87968aa7bb1d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 19:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf7965a3d0e59851c54b28354eb9357c SHA-1: 935ba9d974a6ae49e7bbd2a259abbfc098a3abc1 SHA-256: 202a87968aa7bb1df9f4997202499d633637125179600b60b41d38b73ca2a710
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external URLs, potentially for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://simon-daulte.com/ckfinder/userfiles/files/59790837072.pdf In PDF document text
    • http://djapm.com/userfiles/file/nexefojuninerut.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/45177371489.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/18018436883.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bfa77346---rigojobisizeb.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607418c3c0e89---56806480916.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608285042d304---luvopubiwiwe.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/66127987458.pdfIn PDF document text
    • https://t2sc.me/userfiles/murozinenorivalilo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/gubixewi.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/wigobijuvodawagu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c554bc027ca---83096262121.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/dl9j6j381f0d9holr6157g2grl/tatulisanatatu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/10339017666.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/50583976500.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/119652c5f7a32ad661ede4073bf92b38/tabije.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079765b0ace6---lafave.pdfIn PDF document text
    • http://iviltra.lt/images/files/telenamoribusodajopolex.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/favenugusesixolenew.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160753b59db02a---66017864492.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e80f904c3083fcfeaa49d21679e78253/17326870118.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0227b1932---lituz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=programacion+lineal+que+es+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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 11112 bytes
SHA-256: 4e0574fc8148d644693f385f1316d3de43f30f92c20efcdeda26b54040b6d40b
font_02_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 17412 bytes
SHA-256: 033da503595fb84e1090c4e26ebcb0b74212616c707da067ed541e8520a95b9d

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