Malicious PDF — malware analysis report

Static analysis result for SHA-256 41194deb1e0ad825…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 23:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a50991c6e6720c8e349e4cd0325b5bf9 SHA-1: d56931f1d177e65fe7fc26b266910c5b42e1b057 SHA-256: 41194deb1e0ad82587b37fc1646253b391cb3707e0be87f87cb639e76845cea5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malware or visiting phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://studioboscono.it/userfiles/files/40129885634.pdf In PDF document text
    • http://zonazero.es/userfiles/file/22242454038.pdfIn PDF document text
    • http://guitarenko.fr/img/files/23186980426.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/op23avi6d7ub1329vppv2v0iku/ruzokoxiduf.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/86630461434.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/riwubijisudakezara.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4436298629.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/36819572397.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/pewawapinimekajegomak.pdfIn PDF document text
    • http://marymo.ru/uploads/files/jajavegulitafaf.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/84484427799.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/35348303537.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613380944b8cd---jukorobugifegekuguluxa.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/keloguragimuradafevoluz.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/87008522439.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/62549662260.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe061024a---rabetituzile.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/36800182487.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/5804307944.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/64907257055.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903213851975486.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/14910123885.pdfIn PDF document text
    • https://2acontractor.it/images/file/wixef.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/26988154674.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xutugarulidufujelono.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/jezamujesupotininuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+secret+life+of+cheerleaders+2019+full+movie+online+freePDF 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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 11332 bytes
SHA-256: 4e277bdebabc0c9b426fcc15627efecd20f784cce8c2ea43f4afc20824c3cede
font_02_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 17068 bytes
SHA-256: 8a2ea369ecdedc18ed147d80bb8b5c87aa55ffdc2c00948c093ac99f637e75ba

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