Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fb816520158de1…

MALICIOUS

PDF

98.5 KB Created: 2021-09-15 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f161f8f329634fd52f0686469ddc066 SHA-1: edd82e4b1adcc548d1175479cc63ffc1ef353a8f SHA-256: 97fb816520158de14b74b5a0c3f0e4ceb6705e8fb4e0e2deb332783e8f2a5eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1abo0mhjcbu2db739l1h2eng1/36088165344.pdf In PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-14/20210914070321728263.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161417f2fe928a---89750219429.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e46ba6d4e20990a2d3a6df6d1a2c803d/54868929171.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/3785060692.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/27295339661.pdfIn PDF document text
    • http://client.diffuse.info/files/zeniputuvoperobemawuduril.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/bokuxitas.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/vudojenovejexip.pdfIn PDF document text
    • http://dhf-china.com/d/files/33266760147.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/8764916997.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/22924732172.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9de5d66---tibedabubujukuzes.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/laxokazuvuxabuwur.pdfIn PDF document text
    • http://rnralpha.cz/res/file/60544028072.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f3795585db3cc00392c8a3c9be67cc01/dufigemilogofipawida.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/bizod.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/53496682601.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/rowoteton.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/basabenemuresuzom.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/35723574060.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/8216218630.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xudodef.pdfIn PDF document text
    • http://freeski.hu/freeski/file/89136836149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=prison+break+all+seasons+freePDF 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_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 10344 bytes
SHA-256: 8d0ca98eee18d6780d06d5e931080c441059654c63ba3a8383243ee53ecaad82
font_02_sfnt_off00014c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C26 18524 bytes
SHA-256: fe4891c32031d82c81358fc3babd5dcb66b79088a2393bf79e1c03b81f131a66