Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63f414e2af0b1ec…

MALICIOUS

PDF

70.1 KB Created: 2021-10-09 07:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6cc479b0bc5a4a36758872c41e58e5d5 SHA-1: 06d34f1bf3e8329d0d731314a853baa7d57eb385 SHA-256: d63f414e2af0b1ec6e174035f0a7089ea33553838cebc52436fd88abe299f79d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=educational+software+examples PDF link annotation
    • https://getracemirates.com/userfiles/files/80686069877.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/gujatag.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/rajali.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/26019055686.pdfIn PDF document text
    • http://hevolta.com/upload/file/gobijebevisezudusofe.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/sosavuwarisupisog.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/9377977669.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/48068300971.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xerujofotonekituge.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/sorivejirubawaso.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21b17e380---befagapix.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d013d9b819d547ea603f239712e5a4d4/76195649100.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/50801582827.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/bunizirawonofak.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/38645229090.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109030212037469.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/31009027721.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dc6f74c0f78eeec638b87a051ad8fdf0/99800671701.pdfIn PDF document text
    • http://learningkey.org/userfiles/xuwodumuruxejadusoxop.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/kigefetor.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/rupuzumagofosatige.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/75341841535.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/06ee566a1b36629fb1c300f88abbad1e/dezovimufadir.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/20521349224.pdfIn PDF document text
    • http://oris-am.com/editor_up/jaxituzomeva.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/17907917328.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/raxidovixatirulakefa.pdfIn PDF document text
    • 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 14640 bytes
SHA-256: 3a5c7e7a2438ee497adc279993d80be8aebad86a18e0ccbe999b1a4511a5355a
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 11052 bytes
SHA-256: ae1a487d8eec188c77e78dceab5e6395b1250f6adc4b9ee1d9517b6ab2b81dbe

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