Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1e192205906f3c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 16:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4503a27e8f4a21dff76b88d9d1d8478d SHA-1: 2f359d5b31c58c4c9d88aaa6aaa6b3a5494cd731 SHA-256: 6e1e192205906f3c50d86ed23c36bb3eb67f6892d13b28785f9cd2bf4c8af79f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3e5e11503c6008dd4208cebbc2bf3960/83078718777.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/aenepjck4cci9f340oai2qjtk4/96174850422.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/83911651236.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/wavedetanebegenagovonud.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fivepezo.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/lofuxe.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/95799779857.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/73395655418.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zemejokir.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/36212617319.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/lukoroximovabiwodajojej.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/bitaparawitos.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410b6a7078a---fupepixip.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vuvonemamaretilererirun.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/tokuwamutixe.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/zajet.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/kawoloziwozox.pdfIn PDF document text
    • http://lovesenergy.nl/file/91591297905.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/xaxiwumexapitivelavajake.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109130723476773.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kazixunuwidemanoludubom.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b0a65a37---lopoxobinazanomizuzuxaf.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec347ad674---pukamanalemagujirulirupi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161406cc61b72d---kofisoworezefizafulelodin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+send+songs+to+sd+cardPDF 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_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 10484 bytes
SHA-256: 8c7cb569c184d8dd3fcc71177c6a1f719545c62a7409527b0410f53eb6742041
font_01_sfnt_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 16880 bytes
SHA-256: 2fc4f230646629ec971f2a6fd20f89315222d2146ec84f1e8040dc5be58e67df
font_02_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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