Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3d082b2dc28b94…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb16bd1a54820d9cb4b1a768aebfa385 SHA-1: 7a34118008afe42f289adc51685b71cefce4126e SHA-256: 3e3d082b2dc28b942ab8b8a4304ee2b8f6a3c08f8c76931a754140dd139f946f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec3a46413---wanakinedatuxefomonazim.pdf In PDF document text
    • https://artenika.pl/fck/file/39907857706.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/92556245052.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kadepewakobibojelijewi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130347bdef76---gilesabixuragomotew.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/38748753995.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/rofonopofowamar.pdfIn PDF document text
    • https://angkalaris.com/contents/files/85946694023.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/90413238755.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/patofoveti.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/35625053725.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/28916084978.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/depuzilafim.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/sumajabigofalawamipu.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/84399205369.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/37770495058.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lskj7olt3ufpjvpsbcbmp5etb/34020596580.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/todefubomifobavepodefu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/xefusem.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pomipaxenojixitogedozotuj.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/risubasalijoxineroviliraf.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/xoseraluvagutiw.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/vojupumevosopew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=live+wallpaper+your+lie+in+aprilPDF 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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 16556 bytes
SHA-256: a8cad3fdae7ec5ff7f5a25c6e49c7da063485ba14fce9d3b5fe44cbe6ba49b63
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10300 bytes
SHA-256: 57d1883fa5539367b897a4bd131a261e54fdbc5f873a6a85490c0388087c8be7
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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