Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be2275084ee76f1…

MALICIOUS

PDF

92.1 KB Created: 2021-07-27 12:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b777f5cf47634ddc3f5e80d877a93df SHA-1: 63b10b86733aebbf759de1ce60ad663870a8cf1f SHA-256: 4be2275084ee76f11eb6d488d177949a19b146269fa9120464141e10519c4b35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 https://rdsdealers.com/ckfinder/userfiles/files/depolara.pdf In PDF document text
    • https://sinhadventure.com/uploads/file/52316766705.pdfIn PDF document text
    • http://orderkai.com/uploads/files/patafevitawobujuz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096094b779be---duwimem.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/93934682282.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/wexugo.pdfIn PDF document text
    • https://artenika.pl/fck/file/safipuxemedobaji.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zaxisifijelex.pdfIn PDF document text
    • http://kgmda.com/upload/files/99053515024.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/xogaxanusaj.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/99353297329.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/95408772244.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/muviz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c0b094dc---35939600937.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd68499174---12366375903.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/lumonevowizu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8c44444a6---midojo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/dimaguwi.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vosejokawiginabirowulif.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eef818c04---97584925299.pdfIn PDF document text
    • http://ecole.ru/text/images/file/zotabuvusapek.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf396c9134---nolidate.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xogipagozozujebimixebilap.pdfIn PDF document text
    • http://gabortech.com/admin/file/57898992315.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/53859185993.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/wiloloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+shark+vac+steamPDF 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_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 10588 bytes
SHA-256: 7d9e3972ea6efd27ae1d11598b021e2c65055d81a44653d053e78b219818c055
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 17956 bytes
SHA-256: d29e802303512bae95ad1e4df84a6b9468afe35ecd4546ab8ce9a587a13099a5