Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1c0d96dd0c8d58…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 01:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f28adbc717f4b5c8980012b299890c6b SHA-1: 0d9f31d882f7a3eeab44145aee18ef0baa7d90cd SHA-256: 9d1c0d96dd0c8d58ec66a8ba00e06d32f0a22b70919a422165a38855c48f5937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. While no scripts were directly extracted, the nature of the link farm suggests an attempt to lure users to external malicious resources, likely for phishing or malware delivery.

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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e59i2pr53i1264rf7jr1702332/65530066367.pdf In PDF document text
    • https://reformedgeneration.com/userfiles/file/7413422041.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9da2c4f7fb7054ecee6cbf33d530c53a/kazujixetajotiw.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e4ed740a---gowizupuridiretamukanowat.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/zejol.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lpts4tv49arfr82qd3islsqato/53434361047.pdfIn PDF document text
    • https://activepymes.com/pub/file/zawimixexupekotiro.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/logipo.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/89227263194.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acaee97e0aa---41648994440.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/62934005308.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ba9c46f9b---68079082793.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/sumedigomelitopafajefux.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/19045492067.pdfIn PDF document text
    • http://digifast.cz/userfiles/fuxekejolikilafi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/17501de57617277b7bd13150012bf8b6/29875502818.pdfIn PDF document text
    • https://digireg.gr/upload/43981906379.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796bac93e52---8182452072.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/11373321087.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/novutuko.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/1996444247.pdfIn PDF document text
    • http://abnicum.com/files/file/jivakazuramoruzakeru.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mumituwubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+describe+autumn+leavesPDF 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_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 10912 bytes
SHA-256: ed93bd738d537608fef2d90f542a368730fa3cecfaa7a97ad03c2b0288b1d05e
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 17340 bytes
SHA-256: 597a7bd79eefcf116dc550c2fe1480ce27a4b0db088b65c6e8e7043eec418d71