Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7dc2a8ac170a90…

MALICIOUS

PDF

179.7 KB Created: 2021-07-26 11:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51e7d7d58a99015a03f36634cb606bc3 SHA-1: 717482c27dd289c53ac4cc49b1d34dc8656bd2d4 SHA-256: cd7dc2a8ac170a907574ca6d46f698fe5341722019c05821d8068200d0c0094f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and link farm heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9284

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ambulatorioveterinariocigliano.com/userfiles/files/44299760270.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p51nm7j7srdt7kkk5pqvt5u97c/58456206245.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b97b747a---bakalozariwoz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0af4ed51ca---dotajokafogixiti.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a51ae2f1516cce21becb3873c5ec7787/pizexefonefirolajob.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/93012130861.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b9a80fe499cba384dd5dfaedc6ba3c67/bovopeziwoxuwofobapilojov.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e22dc2a9---45208235692.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae3d626bd---pedal.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/98hqshd0ile10pl2hc77vuiiqf/duwepedipopolidun.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c586272f11c---mutuloketorixukulep.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lijoxetaremabazutobud.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/rovibulupifumuketo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e562c128ccffae9a1f0008f9716e9810/mademuviko.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abadcdde8fa---natojuwaziziwosu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cou9pouq905ov9ku94qs0jkps2/37104273650.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/popaxigasago.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1252bc2e8---konexamofogunaj.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/damumodudofawolejawine.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/vusupisebudij.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wakakosisemu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/thijs222vb5ncg74go1m63uac2/71277730017.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qlm4u2dm48sfs2s80ktvrnmnbi/riduganujepadeg.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/roguzetuduwitexawesimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=resumen+de+la+novela+do%C3%B1a+barbara+de+romulo+gallegosPDF link annotation
    • 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_off00026afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26AFD 19508 bytes
SHA-256: 3a70e7f538115f082ea73bd7559338daec7e33c6b6100be6b17a3da85707d2f8
font_01_sfnt_off00029b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3AC 10956 bytes
SHA-256: e84fbbe01db13acc9cd072881fd68380e61525d8521f2b1694f857fedf69f878

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