Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e5103e2b220939…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 23:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 957fe9e67e0f211ba7a450ee20301282 SHA-1: dff66812f8a556b76e6f46f9acd42413425d2244 SHA-256: 55e5103e2b2209392d626a93b45e825bf71834436dd7dfb8c0fb914822d5f8e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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=supprimer+page+pdf+pdfcreator PDF link annotation
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607288c80b9d1---90636814606.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/xaxedozew.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rifarakixuxikugipikuxoxus.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e2f3f302---52695044037.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/vudebumakoliborapilu.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/zunuse.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/13037967621.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/21560875986.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6kim0e2d49inkl14k9o5akpu87/pomotagus.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/pajitavegupidomasegeb.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/labekubeve.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jilupiwaxamikuf.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94903f073---ruwixexetozovik.pdfIn PDF document text
    • http://www.heksan.com.pl/file/ramoxogitosuwagim.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/76093276363.pdfIn PDF document text
    • http://rococosofa.com/files/files/52175278465.pdfIn PDF document text
    • http://fields-on-earth.com/923613857.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/57150441902.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ov8v15cp2f5q66crktdgnjeh8o/63290593737.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/takilolo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb4c0e48c---lesaginakategowiju.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/45427644918.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92282cdb12---42283891520.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021626125738180.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210602011812.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 18168 bytes
SHA-256: b0d698d6da09a2a4ebf2f8b3df056614413136c63aab09764032a9efa1be6a5d
font_01_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 10820 bytes
SHA-256: 43d400bf9866f90084adc29ebc645e5b59663148f081a8e3a2a3f30b1051a029

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