Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df6a7dfecf66d62…

MALICIOUS

PDF

85.0 KB Created: 2021-08-20 10:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d3b3ab1cf3b4d2d91b1c4130d15837d SHA-1: a95829c3f22c339a4ebb0f5cab9015ca5b13ef1b SHA-256: 1df6a7dfecf66d624cf13035a49d4e107137d1d2c8e74970b7fee90dee436cd7
156 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as a malicious PDF. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://samtle.net/ckupload/files/tukukajavozimijid.pdf In PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/kubiwap.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/besawikovirazuvexibadun.pdfIn PDF document text
    • https://slide-bearing.com/d/files/13805212659.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/potewax.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0tgqj3d6mib1e6favuep3jse5i/juxowiredodazebit.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2dbk8fma6uv49jcekpl0911d3h/60280607210.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806dfd1d1a8---41130621076.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe2ab9d6d83b2901a078e552ab66e7a0/talotav.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/55be38fb046fd0aa756192c75ad347aa/45670822148.pdfIn PDF document text
    • https://strechybenesov.cz/content/96095266877.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/xolupugazuzitekef.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ridutusufisusufera.pdfIn PDF document text
    • https://kham.vn/userfiles/file/65325064208.pdfIn PDF document text
    • http://brlairport.com/images/file/mobulipunuwotoputoxopok.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/pudofoxovogeninuropiselof.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/9378414940.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/jozinafufonupesetixezaji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/khcf4me77q1puu3fo7lbpdsagb/furomamemarozegeteketo.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/sefufonemubumofuwiwanobob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=firebreather+full+movie+in+hindi+watch+onlinePDF 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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 17412 bytes
SHA-256: ef6708b146a0e5daaa8539f9dc0d7fabb4268e5d64908c8bac7241502ccf93fa
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 10944 bytes
SHA-256: 13ec9557659dbd8e29fa5d6611d127deb9928557b85eb9ecfa7e93f778f59706