Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3b8e80863413a8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 10:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 435d4f73a3836530676e552a73e5d937 SHA-1: af76bf99a9afd553ff02eaded3b4a0166b774d39 SHA-256: dd3b8e80863413a8df46abdbce4752d80b929bafcaaa3ea5cc3091bde43fcbc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly support its malicious nature. The file's structure and URL patterns suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aqua2go.pl/galeria/file/48113393032.pdf In PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/99098689560.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/femejexa.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/42160873126.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/47325025245.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/96228524762.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/masukufaxodukenilevebu.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/68368980692.pdfIn PDF document text
    • http://synergyproperty.com/images/files/64131277517.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/luditezonavidakemefelov.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/rosimofibo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16142a330d5033---25834611744.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366499ca2f6---vifof.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdfIn PDF document text
    • https://basisnomor.com/contents/files/wuzejoturisexanebefoxesa.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/27539096998.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/sebijuzatutubamemovere.pdfIn PDF document text
    • http://aimic.com/userfiles/file/12995718459.pdfIn PDF document text
    • https://esz.jp/img/editor/files/gokepobupanurok.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/zukalojivegobememamiro.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5cc330367---3987762097.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/84884114502.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/34175450906.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/sejuwuvuriwiveza.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/zereturufitugetiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+studio+interface+designPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 10688 bytes
SHA-256: 9d8628199e99299bf1c0e2d9b6587b3fa5d94806331cdb3969045c4ae7b2afec
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 17280 bytes
SHA-256: c81d50a5a7917247827523cb46d9cdb4255903efe257f1b0cc41f56213eb2002