Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ef88d52d945bff…

MALICIOUS

PDF

123.2 KB Created: 2021-08-07 16:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e0b618a0bcf90d119d7ee66cbca199f SHA-1: bd1ba5aaff3f56586a900a1f5f375428433a7dab SHA-256: 47ef88d52d945bff7b06aab76bf90d3caf5878ab3e709ca40f873900effbc3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://dribblebar.pl/userfiles/file/27680133711.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b6dedf05---fitisapumolajigozoxel.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/43878216922.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/palagonupavuxelorej.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/18687221677.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fb3uv61vipbnqhpf66m5tkphc3/36425507013.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lomilot.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/pugefo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/93978134968.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4aca4ee46ede0e94f6eddb3adf667c68/tewafebowitok.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/40457082574.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/vofijuvapofideresegibi.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/zekijadawizevefojipatadi.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/duxanobinomoxeje.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d5386036---tomafuzesefemuvadopoled.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b663d3f90---88622283488.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/36db0d56a64daba17a181ef5d092b030/lusomilasuzasugugofumu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d08f8371bb9---wemasebejawanam.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75724d8d9f---ruworoginawupilegatusis.pdfIn PDF document text
    • http://twilaw.com/files/files/tafikifope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+most+accurate+catholic+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBB 10624 bytes
SHA-256: bbccee21d7b61ee8427771d3ebd27f93ac8b41adacae15dce91146783d888d99
font_01_sfnt_off00017811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19023 21032 bytes
SHA-256: d8f81fd9ee61cc3eeb176bdf62070aa7a43c959f60ade332ffa042b15bbd98e5
font_03_sfnt_off0001c60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C60B 16880 bytes
SHA-256: 27555b4aacd81d454f4cef3b99610c80874433bb8f5e8cd19163ec776586366f

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