Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10d4a3d6693560d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 04:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f31f7053f6b751f9065ba5bc79f53c5b SHA-1: 90c641c2c2f199a1edef7131f3154788d05a5de7 SHA-256: f10d4a3d6693560d2d00a24a99c1864f9e835e1e7db873305a294dc1b743dfc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.neoneofitou.com/ckfinder/userfiles/files/xetakoganowafejufi.pdf In PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/84285302490.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kapanamalazofeb.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fju5p0nvm0dn9du4b1amrhq3c0/lerosefil.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/51485861093.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/palivi.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/37281997680.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/sotesokeb.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/40924416820.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xutexadepusogogebonanune.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jajuj.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/8970244972.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210904130459.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/fomage.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/94721437690.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137678e59947---ralodupavuwesamat.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa1a30559---63159200372.pdfIn PDF document text
    • http://strandedtattoo.net/file/lutalemalumirajamizizaw.pdfIn PDF document text
    • http://www.andreapondika.cz/file/kufukubenozepivigu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b4108d9f---52288426554.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/51262693253.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vn2i2pi51vnjh211ugca9lb7s5/87636462608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dont+breath+twoPDF 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_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 10128 bytes
SHA-256: 18086fbadc020287f1c576920d58a0c39df360eedc2825db5e14d32a48c8f313
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 18544 bytes
SHA-256: 4645c1ccc2c4404fdb5aee58564bedeabbe438ad6678001057a0c5a2f0aab3e1

Open this report in the interactive analyzer, or submit your own file for analysis.