Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aff7e62ffca82b8…

MALICIOUS

PDF

80.9 KB Created: 2021-08-04 10:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 321aa6500abd7eeebd15bf61d851535a SHA-1: c65bce3f3cb3057893f8bd6ab76828a9c957d3d6 SHA-256: 4aff7e62ffca82b88a04d1d5d7fbde30e88fdd80c42f8b5c55c26658cf22e646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/94f43089f2f73f8bab523efca68d78ba/81370208418.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc4623c7b---68533769244.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/79268943394.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160775d24c1922---dirapi.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/7607924737.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/jivuxufaxasarevoz.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/guvilofopow.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/dizuvuguvemajewipumeduruk.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/80af0325ece7b709f71c48249b73b046/32335146267.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/33028195573.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/jiromijinivebejejox.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072524a59069---54955778905.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/devix.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/getipizulojafibetisutofon.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b3b7860f---41219663621.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/56329079132.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85b28e645---sorurumiwexoxipuwika.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/fodapigaluxalogarele.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff46e5941---sakogegaxupebutabopi.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/titunapobabagi.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/12628516095.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/sikazeroj.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/gobibuzavovumiweza.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1460e19dd7abfa0e6efe90f614cb94d/tutepuzizetezuras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cf+moto+250+service+manualPDF 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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 11072 bytes
SHA-256: d915eb78afe1f14c101424c6ac7ab8e7b6012a08906ee9035cd3d7f66cdd1fd4
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 16512 bytes
SHA-256: 7c55fc833104f476f675ef3b53e6ac5584d097455ad30954b8744b3565a11d6a
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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