Malicious PDF — malware analysis report

Static analysis result for SHA-256 d595ea79819c3b41…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 23:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e056d5bd28ab1cb375f44fc9405c83b0 SHA-1: 275e3cce6dfaa6ac7b177b980e27afaa1d650820 SHA-256: d595ea79819c3b418307dfacd2be7572d45a9bcf109985e928b9b8c17f377bd4
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xhiehchin.com/Xhieh_News/_file/fivelamajugirivokowanati.pdf In PDF document text
    • https://melnikhouse.com/userfiles/file/21207361957.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210914165332858312lwce2.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/gewabirojebilajowe.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/66477482395.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/rakuwibebanogugi.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/24355933281.pdfIn PDF document text
    • https://agros.net/uploads/file/69954838458.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1478be5bd---65748561288.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/25355560795.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/pokewiduvof.pdfIn PDF document text
    • http://4bx.pl/public/file/93636942450.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/bilevakokazopajivenuxa.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xevijim.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/53853399235.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/76687218050.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ed42c2f2---23549462046.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/42604471135.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/bukevifakebeje.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/10708531470.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b4766db2---fabiduvijepimuk.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/7818281067.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/28727392729.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/34549650221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=app+qr+code+android+gratisPDF 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_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 17756 bytes
SHA-256: e98797a15d7402800164b4af2cb56bcb39e81398e114f26c48597b9f060ecf9f
font_01_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 10772 bytes
SHA-256: 6c725c030f9fcca7c59b9068a9e525abf9f359cbef397093cd444de399934f0c

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