Malicious PDF — malware analysis report

Static analysis result for SHA-256 4459c1eb9cee95b5…

MALICIOUS

PDF

83.6 KB Created: 2021-07-30 21:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 31d2bb3fb35eb0b44aed158e440e7c91 SHA-1: 9f76d0256f6fdee435b35946948aa5d6766d392a SHA-256: 4459c1eb9cee95b5a423990d4fbcf1e3726bae2c1df36b8cf0d618bcef73397c
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/madubarulufogedev.pdf In PDF document text
    • http://stellamaris.cz/userfiles/ramopizexuxaju.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8864b63878---rezenoviniteluparawiguj.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607746e34efb8---51698520452.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16071593664cc9---55035200715.pdfPDF link annotation
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/semetivowatitonusudige.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/tijezirulisa.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c9a984b4---22219859410.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/12c471042283ac63e3fb0d85103622e1/41110038822.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/63579462615.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/20bcedef2fa0008d816b806978cc1065/nirapi.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jazilonigosidibiforituw.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/xenegowozefedidemomudiner.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/57360982967.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b337c3b9ee---70546331232.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/57813991510.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/roxavunexe.pdfIn PDF document text
    • http://kag.fr/userfiles/file/72548396393.pdfIn PDF document text
    • http://bjallstar.com/upload/file/7411344749.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/noteje.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nebijaxelipomibigake.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/pazugigoraz.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/12383990129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=istvan+banyai+zoom+pdfPDF 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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 19372 bytes
SHA-256: 069526e7f404865c9b9ca0972c635224b0dec1d6d4d471297e6194b44afb2e34
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 10712 bytes
SHA-256: 8c92baed740868049e769dc08c9ad9152509e8be3f5b112e3dea76aa2d89bbb1
font_02_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1