Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f016070aa0c23f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 16:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4d5744142cbc08970cff6bca2ddd4ea SHA-1: a4d096a0f52a0ffb9db56b05c85d5bbff197feeb SHA-256: 27f016070aa0c23f1358fed3e47e766552db7f2d526624e97817ec5688416644
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kerrya.com/ckfinder/userfiles/files/lasigudojifemurisapojiruz.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/jixabik.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/90890023175.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/97940594310.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394373ed8d4---sonegal.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/puvemesetikades.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/sutunanemipabufal.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/32370488010.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/16746634271.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414abfd32d6---fakexogedokiz.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/90258139830.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210913115605_484204258.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/dopuxodi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hpkcahh86tmcr6fqdasqstpn7i/luruzemekifunor.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/665forl6g19rf9uuqchchutgqn/1275808539.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/29688570843.pdfIn PDF document text
    • http://computerdoki.hu/user/file/6816288624.pdfIn PDF document text
    • https://ayurmitra.com/files/file/48658394909.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/43910894380.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/vemadab.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/45282709747.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/38391360763.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/ralojamoleboziduve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+receive+push+notification+in+androidPDF 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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 17032 bytes
SHA-256: 67fac668331259c5be7245a1684eba7b665c95eb86b2c3c6af5fba7025507da5
font_02_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 10912 bytes
SHA-256: 7b8bcaedeccb1b3dc756819254e3bc995e20f8c7e65fbde36688002b08867503