Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedbb3b86d654517…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 14:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e46b0123ce4f14d0c3901fab4848c97d SHA-1: bcadd5738b4f3c850df60397aca7557f8ac46af1 SHA-256: bedbb3b86d654517665f6fed74e2e0772907d8c7f92b5f9b8330c8d3b5a43cb0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple unknown URLs, many hosted on compromised WordPress sites. 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 URLs suggest a deceptive lure.

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://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03f484e5a---dojurowet.pdf In PDF document text
    • http://c-amc.com/upload/files/zejudowolaze.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3f18d0398f28824677fed285d8fd4122/44962323371.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/57815882489.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4be64e9b---5487461435.pdfIn PDF document text
    • http://millecolori.it/images/file/31616912062.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/93522387803.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/5810231519.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/35774270788.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/tuvovewul.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/buvijetesubagewibiwo.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/33842790083.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/8827652415.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109091121296862.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54203069456.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/wivunuketipugos.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/39416746377.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614479a952c37---22764610568.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furatemafavomojato.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210923041300.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/21145887054.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/21850553857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=brawl+stars+mod+apk+new+skinsPDF 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_off0000be29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE29 10784 bytes
SHA-256: c6ea8e6bcaff281782e95678ba1eefbbd2c9145ef66c0e32599cb56120c710ea
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 16688 bytes
SHA-256: 6b46a7afbceaf372eb5d824d6c4e3e8148d00eb4be92a97ef1b11828060b2c9d
font_02_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1