Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f924d9603feb8e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 04:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4593cd65138f00c320dea84e9425722c SHA-1: 83ffca8f480a6d9cbef4d5b79a359f821afebbd0 SHA-256: 77f924d9603feb8e46ea82bb5ac610fd1d058fda671e7d00c8af8c600edc8936
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bash.cl/media/file/74033823697.pdf In PDF document text
    • http://studiophotosfashion.it/userfiles/files/51818982076.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cb42d15596c3cee703437820e874a9e7/nowonedibo.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/86610540855.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/75200583818.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/78551799160.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77016449467.pdfIn PDF document text
    • https://path.mn/userfiles/files/26182639416.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/82894312916.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/bimupovatiwezoremevo.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xogijekefovesupoko.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/10055056256.pdfIn PDF document text
    • http://salt17.com/userfiles/files/233870759.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/14515110608.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132838a66b8b---31614019636.pdfIn PDF document text
    • http://susutour.com/userfile/file/liditirunepuwubutupi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e14e37866fad2fc2b4967a7abc96e8cd/tuwerowuwuvababuk.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109130951025546.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/48396653445.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/13854193235.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/vuloxuxojidov.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/14728002690.pdfIn PDF document text
    • https://magerp.org/upload/files/14986024533.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/59460638981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=8+ball+pool+coins+hack+linkPDF 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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 17752 bytes
SHA-256: 57db92795d29430443b152d7ce0c3dc05dbb835b15bf3af8151e93bedc07ca85
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 10484 bytes
SHA-256: 13abf11d52683e6f44e3c2486eb607efe1d3dde3b6b258273751bbfbdf394e13
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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