Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5e9ee2e0ea83d…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 13:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d7d168237310d3d1822198c9dfe4255 SHA-1: 882dadbbb4919a8babb148bf77be4815cbf40ac0 SHA-256: bfe5e9ee2e0ea83d8d5cfd17fb02ed6982478b8eb1f312a136cdee9464d41c87
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://philabc.ru/uplcv?utm_term=meaning+of+cense
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08b55cf42---97411413723.pdf
    • http://efuturesthai.com/uploads/files/zusugigopurizodewilifixuz.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607889f9f26d2---jonir.pdf
    • http://breakevenpoint.pl/uploads/editor/file/wolorezedobi.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c3051915db931226c699865ccd01743/wabiwiwigofejijexu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/6fe9nkrrn8m39evolcomdgvttg/bozalo.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc83ebeef53---legafiposizedid.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/166273335f49e003f6f3cbb1e1dea27a/vapujikadazeg.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c9b53ff329daf1ca242fc2cad8164546/3332764182.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5f3803587---7991138198.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b42009357---nexovipifizova.pdf
    • http://xaydungphongphu.com/uploads/files/44542975515.pdf
    • http://anthonyvienna.com/sites/default/files/file/juzopugilapukuginuru.pdf
    • http://deccanquest.com/konadnew/userfiles/file/74227458665.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9903cbc40---gavigidegoroj.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c3c7dac9---8632139450.pdf
    • http://amandamaitland.com/images/file/fiwalagebev.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/18007075409.pdf
    • https://alakharia.com/public_html/userfiles/file/midapixalotiduledo.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d2924bd807548f37225007a7fbcadae9/65149797761.pdf
    • http://studiofapas.it/userfiles/files/85827835027.pdf
    • https://alakharia.com/public_html/userfiles/file/niriku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cb18.bin
aa8a666e5188fd2fe699cdb7491f9d6c4b8d7da263a63d6e678c16b73d43fb98
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB18 23500 bytes
font_01_sfnt_off0000f3f2.bin
ceeda5a9c53d7fe3b0a383490cb2b33dfcddfcee18c7f845b05b929de2389c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 20892 bytes
font_02_sfnt_off00012958.bin
764ce80a2fc6899f7c4ec2ebe1911ca1dbda07e77e1fc950cf84d4bcfc85c544
pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 10260 bytes
font_03_sfnt_off0001408b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408B 16792 bytes