Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07734975fc29aee…

MALICIOUS

PDF

110.6 KB Created: 2021-09-01 05:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fe53d74bcad22749479b9b7ac9fb7d0 SHA-1: 9ef4206b81de2d902b7ddcd2cfbfd5611178de54 SHA-256: d07734975fc29aee7d3655fe9a621f128f638a80236e77c480c8bf7fcb81507e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://esoftland.com/userfiles/file/nusop.pdf In PDF document text
    • http://unsersohn.ch/images/file/dodixoxupufibomuvafuz.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/nuzad.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a505a8c9d---94578458895.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/fofekabosejemo.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/fekuzirotomofiroxe.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091924a68421---55400453281.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f147fd57b9cb53ff3ff5026576b7e4e1/15064225254.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/dadekorobukegopuz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079d59c144d3---4140483723.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/puxewipifosevufetebuma.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/14908992873.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lruf80snmsgpc07lsjncvbs7h1/sizunijap.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ec858d9ffa7f05377ffea5f958cc7c4a/84014104336.pdfIn PDF document text
    • http://www.bash.cl/media/file/76557706595.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa612e9aa50---21841071184.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53740799159.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sidalowufuvexusuzobizujes.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jitonawa.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/bufogodixub.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af4ebeb68---43081834288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+chatterley+affair+full+moviePDF 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_off000145ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E01 19984 bytes
SHA-256: 74efe8da79ca920a834b5ab845a5252a2154fa34a5e3faca8b69e7481ccdc925
font_02_sfnt_off000192f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F3 10572 bytes
SHA-256: 308a8738791e18fd88f2074acef299a15a03746660d760effb55a79ac94df1b2

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