Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f217e45b8ee699…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 13:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8142423f68151854b0416dbd3458b335 SHA-1: e72625360dc1b8140fe4b0cd43e1b484ff34e3ef SHA-256: c3f217e45b8ee699d859edc5ba4a08f8c52d02c31e0fc1e09fc0c5f4f55e6f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18293118945.pdf In PDF document text
    • http://fiumevivo.it/userfiles/files/39998534663.pdfIn PDF document text
    • http://handgun.ee/media/file/didonolofezugopisugoji.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/befevefivej.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/juzusofijuz.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/11981748234.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d7379d02---mivepuzepurupobatal.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/17465276195.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/38849919630.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/liroretatajegirufo.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xovinetimoroseg.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/rezogomumemarumozax.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613453647ad0d---dewopuwulokoxupojenuvabur.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/vizopu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3d84bc6b4c26f326214219ea71370012/zemumad.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/84152023282.pdfIn PDF document text
    • http://infosierra.es/images/editor/48355714157.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907145921113.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/23699874958.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/fejidamibinepagipip.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/mewokigoxizaxunigo.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wiwekewewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=444+spiritual+meaning+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10696 bytes
SHA-256: 7fa0705efb4727c8d8366aabada1f074fbefce5ee59a43712781a55b12d638d2
font_03_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 17072 bytes
SHA-256: 41ffa79f506be439f221dc641477f6bcff0deb25fb0e6b715bcbab4714474ed2

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