Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf7cf5dc868753f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 11:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a28f0d140a773ecf3943d0bc7ce5793d SHA-1: 9bef0a06cf6076a466543dbbdda096fc35fc07d9 SHA-256: 8bf7cf5dc868753fc2cbd70bb35181d1f9e7c38ac8ed71626ca759264acfb41a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a redirection mechanism to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://salonorganica.ru/upload/files/49737255440.pdf In PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/96459913831.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/26241540549.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9da8918c9---20558623552.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/xositebekodabexomenumu.pdfIn PDF document text
    • http://xn--z4qq44i.xn--kpry57d/upload/actfiles/49616447853.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/33238142765.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/jefejiw.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zevixusoturogi.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/16798452465.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/44732652872.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9872a0c0---muzezejijepifovotuvin.pdfIn PDF document text
    • https://dcimx.com/files/bivufanutixifi.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/93929320623.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gizopekeni.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/fofazebonazuxe.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/suvibexejikumapulawujexut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130448d6e24f---nikilovarigi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1f708d211500b7050d93f78cecf9ee93/51579595538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ramayan+pdf+gujaratiPDF 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_off0000bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD72 10764 bytes
SHA-256: 8c100a88c62c8fb03f4e853cb90ae17f18d60bcb6a2308c54306057b454a9c54
font_01_sfnt_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 17012 bytes
SHA-256: ecdcb3ad56d8e35145f5e5b25e946e4d5201726e6a9cf02433a2006d87cf5365
font_02_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1