Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0df7263bfd34ef2…

MALICIOUS

PDF

100.9 KB Created: 2021-08-02 00:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b01490646a6f214e1b805398647083f SHA-1: ef17609c0a1b8bdaf5e33af6c60e709c37f989fd SHA-256: b0df7263bfd34ef2b4f4da5c5016f67158070a11bc05b5fdb60c8351eb10340d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://pixomot.ru/uplcv?utm_term=factoring+distributive+property+worksheets+8th+grade+6 PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fca565d77c0---25419694850.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c13972640ab---6730958774.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kusevur.pdfIn PDF document text
    • http://beateromer.com/bilder/file/kumalabajal.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f0d5725dc00a04671310969f707c1fab/61262201043.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/sewirijogirurogukabefozaf.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/danavamazigowutalene.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/voderilizef.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/918229473732c42435d21bfddcc138af/jifili.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3b25a7038316dc9593d917c7e83c1f4f/defis.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/nuwota.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/woliv.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/75729139907.pdfIn PDF document text
    • https://samowar.ch/upload/file/48139893618.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/dugetekano.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/tawinep.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a236e34b0982442d12f6e65871626f46/22598371207.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad697c39779---84799806982.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zotirexu.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/finawutekevag.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/gatugerepitujomu.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/dozitamudi.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/dafuzelamawidon.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_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001339b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 19016 bytes
SHA-256: 68fcb285572dfb50209c6a169624c6463165a76659b7b9f183e4cf6bed3ad1c2
font_02_sfnt_off0001663a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663A 11700 bytes
SHA-256: 8964f79fe0397114762d1e44574947787741bb654e50107e8b74f08ec8263f9b

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