Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35abfecb70c4436…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 07:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e155f209327acbefc355433aace88913 SHA-1: ba1c3ba8508c2b6ab1188a779d430ee4b58bc26e SHA-256: a35abfecb70c4436fc1928f2aefcb1f3e2f58424cf2b54305c1087393dfb5d3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the use of compromised hosting, points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=best+writing+apps+for+android+tablet PDF link annotation
    • http://njchemland.com/upload/files/19336970920.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/95871473338.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fumelapakudaloroninez.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/surawuwekulawuwerisaw.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/xotarosuveditolodilexevub.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/22861993943.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/64760648471.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149b57b1f1b6---vifufunuduf.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090421035173499.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/39919657133.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42165867799.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/depisesamutu.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/49668444585.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/98564754077.pdfIn PDF document text
    • https://pellevah.com/upload/files/miberajupukudas.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/80201270336.pdfIn PDF document text
    • https://atiksigorta.com/files/kizuru.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614501e9d4bac---2868246572.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/mipuvuziwozuvafifum.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/zanivarawimukijulugaj.pdfIn PDF document text
    • https://il-gusto.com/images/file/mowonozigovija.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff5e4ad0e0---31321833582.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/52370892122.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/papubifidex.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/80264668245.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/dupilaxikibegububazeva.pdfIn PDF document text
    • 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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 15316 bytes
SHA-256: 0014669fdaf0d85b259386901720873941b0330c4a1b6c4adc92c487479bb383
font_01_sfnt_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10952 bytes
SHA-256: c74e1ca89449ec46c8c722fcf22284ca0a1cc24250493179937dcb4318886655

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