Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1b3badcdf48039…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 20:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30bc1d6256e6a7c4b66c0ffb81323961 SHA-1: 89ab686c458afe6b7ba757bf227f55d8a7f3fa62 SHA-256: bd1b3badcdf480391d3e8e307598b3ae380dd3483598b5ade63cfd3e25fd3aa0
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The embedded URLs are designed to lead users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://opuspointpartner.com/ckfinder/userfiles/files/35740752654.pdf In PDF document text
    • https://semagro-msw.ru/pics/images/file/99767995779.pdfIn PDF document text
    • http://mimpiindah1.com/contents/files/52574126638.pdfIn PDF document text
    • https://777mto.com/contents/files/30812814171.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/41511624376.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/kotefupeberixazuwaledega.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/71990813554.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2d1170804654440351f42fc4f606264e/66199960258.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xivuzopun.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/41508455543.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/4555111840.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/77741859240.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/17329496408.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6734191ef---32883238033.pdfIn PDF document text
    • http://e-district.org/userfiles/file/47966588290.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b4c0226---pawivoxim.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/49182290944.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/34492628084.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/62417472348.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kowad.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/78763896701.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/74939529669.pdfIn PDF document text
    • https://hsse.cl/files/90804723685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=otnicka+where+are+you+mp3+downloadPDF 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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 11200 bytes
SHA-256: 7308c4b6a5d44b5ba6d36eeeaafab03340a78500b01d85aee8e06fc71177ec5e
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17220 bytes
SHA-256: d52506abd1422220a03b80fbd9ee69a48f520d31de003fee881cf92bffa0d50d
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1