Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfa4750da5d608b…

MALICIOUS

PDF

91.5 KB Created: 2021-08-20 17:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb083d72fdcbbaaf7908e22e185b38a7 SHA-1: 7733097d6027b81c5249e29cfe15b77dc9d684fc SHA-256: fcfa4750da5d608b6e8927e9530e005540e7b7dce6dea9c9a834175e82199d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=what+times+what+equals+310 PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c698b8c1cb---xinajo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1730145d74---29763629550.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/desibip.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/figawebi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3759af14---70632328305.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082239993c6d---52764803899.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/11208693992.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/luloganimesurisa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/58846132432.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d6d7e99c---7015641749.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/44073652491.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/94311366955.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/pewewapuvitomesa.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/78592873407.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53398166148.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8ftkd3sr12otreshrpp94kldao/xesopodunukobeg.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a395b06ac505ca688929393d173cc372/xugutifakijora.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075016c7c---32983027302.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/89580870888.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210726105211.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/wonokokuz.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61def886c6---4921776814.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2785c65d8---nogilodusozobotasopuk.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772de1a3b92---89005545897.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdfac23398---sidojilebugep.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_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10720 bytes
SHA-256: 6c14f95687aa84c1c9ea929b1192ba7a9e05a67ba4f485813b32215b6000a19c
font_01_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001366c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 16020 bytes
SHA-256: c0127ff0c805aaeff5290914c25bc979580ece887989b898e19b317dae2280d5

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