Malicious PDF — malware analysis report

Static analysis result for SHA-256 94201f2a2a228f53…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 19:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1af3a81ecf66c95b87a6a0128f9c4b65 SHA-1: 84610e72a687cf83f981a82d622a0ade2af6d96b SHA-256: 94201f2a2a228f531160f54dfb8740c4d26f840d80a0e9cadb7d3df2f3840717
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

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.
  • 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 http://architettoseneca.com/userfiles/files/potapefaxino.pdf In PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/tewawilatunu.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/21107862877.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/wadisufuvagebuf.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/ruputi.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/6691290849.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/73932909590.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/42512554962.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/92358823489.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/zemazoxenejupalitoritis.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/lipadeborom.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121a17644ee7---13460848381.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/353ae56cf15257e0be7796e17f5686ad/75580102105.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/76918419633.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kikamaxukinibos.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/bopejojojunidikufu.pdfIn PDF document text
    • http://c-amc.com/upload/files/27878292480.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbc67d93f---87272531556.pdfIn PDF document text
    • http://faradbox.pl/files/file/82519158193.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pekifajojoporunafuxuz.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bd31f5a5---30185496496.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f1e8249e---3494362095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=resistencia+bacteriana+en+mexico+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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 19340 bytes
SHA-256: dc594967deb2aa915e0cf0819d707f8e7601e04818b79ebb7812bc76ef0f69d8
font_02_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 11024 bytes
SHA-256: 9cbe38c3c8750c28c42bd1e857c3f4df38750e9103999a4e6061a783434c53c6

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