Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae18f252c8d76a1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 09:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5622fbd44fc088fff9ee3dfc6cdb2c3 SHA-1: efc4588177b174d611778d147f5109e2d4739a05 SHA-256: cae18f252c8d76a1a0c0025d8d463ffa2faf53e3b2cd112c8cbb78ae9e1a12cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://hzeiger.com/userfiles/file/xelebezejel.pdf In PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/jokane.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db14840cf---34240222231.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/47005834518.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nerol.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dabuxajifos.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-12/20210912135655611242.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/38892711500.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/67194198370.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431b87e5fc2---xakonowuv.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/remirifejubasasafuf.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/59107210843.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/11300365344.pdfIn PDF document text
    • https://nexapos.com/upload/files/45671992227.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/93414993182.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/6038351091.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xubut.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sirego.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/34872795038.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e541aab1dc---firufamunavekowabawuzur.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/26402854385.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/j9ho5ivhrh62so8m1blpc5s2l0/20994901147.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/64af59e8226b4f2f7036370aa114cbe2/boxokemogetoza.pdfIn PDF document text
    • https://maviet.vn/upload/files/pujewolelot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sunday+night+football+live+stream+freePDF 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_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 11296 bytes
SHA-256: 7d213aa19b329824d8568469516d01e2e7b218b675caec8325b122f59302e1a2
font_02_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 17064 bytes
SHA-256: e81811c708c3097ea31009006c3357951f89d4f71b76e4d2b9d232dc1cdf2199