Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c2fba55da1f1d6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 22:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3aa4e8f04370db357d3b99c3ff4a2be SHA-1: 5456ee8b1d57038386519dbdda27157f89032d91 SHA-256: 91c2fba55da1f1d62586d35d0ac28c5d45113659901a764ea9987e13fb5fdcc6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o01p9tlr5tmfcoakqcp4s36n6q/48055477924.pdf In PDF document text
    • http://france-ex.com/images/blog//file/jikilab.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/39597823673.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/ridaxijisisi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7ff9ed802babb3b91e9acff74cf187de/29816267853.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gepisoluzuzovukum.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/77119824694.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/besapajit.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/xuzugukowimonuzewunuzela.pdfIn PDF document text
    • http://texmet.pl/userimages/file/17479989166.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/gasuwovinenegumu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c0d33c79---9572100994.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q5tbcll782gnpcq08896lrr5c7/50433044783.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/6743558048.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/65578866397.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b058914afc3---38049406613.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/13124230385.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xexezuje.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/23630297728.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vazenibanilelexonigenune.pdfIn PDF document text
    • http://asustainable.com/global/file/pulogipij.pdfIn PDF document text
    • http://rsst77.ru/upload/files/90101406734.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/90k1v1jjjhnuhiq5gcnhe92ro1/94558293494.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ceaf30474---43943613024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kanger+subox+mini+user+manualPDF 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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 17960 bytes
SHA-256: aa6748b8e5db67769b313856f2f15230263401d9ba887cb0e3bb8eb61f48839a
font_01_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10688 bytes
SHA-256: 438ce0911e928a362310929b02368e292fea1025395ac48197ab08fe64c0510d
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1