Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fc47383024e5a2…

MALICIOUS

PDF

95.2 KB Created: 2021-09-15 09:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31f4298612efd0836c7df181fe7b7cc5 SHA-1: 4bcf75b7e8b2a15f1500ba5e7954be98f1d66a7d SHA-256: d7fc47383024e5a2d0a4d0778027c60053148963fbf0e4bf70542f5d5205243c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The primary purpose appears to be facilitating access to malicious content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://weiken-rc.com/upload/files/bolajokex.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9b71423e53513329994947872d9e5acb/jujapivasolip.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d5e151e79fcb406dadf261db57701d70/zizibusagul.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/54225732907.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141726261ca2---wuvuzevewinavi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03d448555---zefidok.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/16653925292.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/7711747842.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/55380248810.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/60302234592.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/danotinejijebumo.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34937764147.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/28893912521.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5cd74112---rujuvewotitixapodu.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/82446094373.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/nukisowom.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/sosibelegejejaponopone.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/rubut.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/87687931573.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b5b3526b560ca28163e86130fddcd085/mowepizoxogokejanozat.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210906_AB2CE60393C4B4FB.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gakituxizuforonopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=get+free+instagram+followers+100kPDF 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_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 10948 bytes
SHA-256: 1d19d91520e51a856050a044a469995b529bb1feae09042f0a2fee8ba4497e51
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 18444 bytes
SHA-256: de5093b3a06a708fc360af612cdbce846f3cb11044db66e19791ab201f0917d2
font_02_sfnt_off00015738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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