Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6e29d666640e37…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 14:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e0e54642f193a937d440d6575df9db48 SHA-1: 28c192db72b4f33157117dbe2b5a6b6eb4c65c9e SHA-256: bc6e29d666640e37ca9e5b534be2028875c6c1443530635f54da93776f2aafc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristics and numerous URLs suggest a redirection scheme to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://shippingengineering.com/files/ckeditorothers/fewovojitikadeta.pdf In PDF document text
    • http://contextuae.com/resimler/files/29056092146.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911011208_hbb6ka.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/51350812091.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/gelitafakafejodas.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec14a40b7e---wezerasop.pdfIn PDF document text
    • https://soechi.id/userfiles/file/86394730369.pdfIn PDF document text
    • http://vhshf.de/File/44705413903.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82225868745.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/soralivix.pdfIn PDF document text
    • https://alpinashop.bg/files/rikatenufunoxufumivup.pdfIn PDF document text
    • http://whatdwellswithin.com/file/45085175197.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/58400002931.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141286889bc8---39828788113.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fabikujuvat.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0ep45k3umr6ufpqgp03kd2ggfb/65058696506.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5043853f62c5b1e70dc269ad8c276e4/37540032193.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/42857273113.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c5b50ec5c---30402779543.pdfIn PDF document text
    • https://digireg.se/upload/70774022788.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/41045293038.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/soxuwuvitolajuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=thoptv+latest+version+mod+apkPDF 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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 17956 bytes
SHA-256: da95d0d125449ce785d89ed4a5a6f62de74aef59ec9cbf249dc4d4611faf1166
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10780 bytes
SHA-256: 3dec1f273e4a1e1cddc34c429eb940eaa772b68da2df17cbe0d29247f8327d37
font_02_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1