Malicious PDF — malware analysis report

Static analysis result for SHA-256 11626ec92655dbeb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 12:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c45f5e7fe7e1ccaf864ca816b2d0233 SHA-1: 0d2c0a9c7f19fe13415557f74c2e079a78143048 SHA-256: 11626ec92655dbeb1bf9c27c216e0fd51ae9e8d16348a256b3b4fb1b46ef97ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sp2wronki.pl/fotki/fotki/file/59014351507.pdf In PDF document text
    • http://tuvantindat.com/uploads/2021-09-10/images/files/jotofikivokitiduvujax.pdfIn PDF document text
    • http://cx-gl.hu/images/files/2577240998.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/ab8ab7366e2ac3249aec667a9976072e.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd8561177---zuledobosorivosana.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9e9437cd1262446b4aa631e927627f2e/norumatalufuzesaxuse.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/368601d7fe1c977096b928742872bf73/talipinit.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/vejutugibatesux.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/diremiwapipavapopimes.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/rererorotajejinole.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/lematapafemebewufum.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/jototetete.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a1da92b36f7b6b0443e4e10738a275ba/wasimomejojimorawi.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/56349353863.pdfIn PDF document text
    • http://juncheng.tw/upload/files/86736719103.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/50805767400.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/rixurafitev.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/90434327286.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/jarowobogifuta.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/50575348793.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/48617844907.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/29487420089.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/81488392871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=phonegap+android+studioPDF 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_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10728 bytes
SHA-256: 8585f61ab4db3cbaf6e9a7a162f671a7bd62544f856b012d33b9273dbd3caa74
font_02_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 18276 bytes
SHA-256: 493f650aeea54f878217d27e1699b5ad3abd34affbf2d0dc6ce66e53bffd7a1b

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