Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8bb1a03afb4633…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 12:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04f574cbccf07c568fd86507cb3cbe7f SHA-1: ef9a6266bde1134001817bf49992b4d56108b8ab SHA-256: de8bb1a03afb463324190c362d75ff792289a4591fc4f20e055f7ac7145bc24b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the links as a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=compte+rendu+type+echographie+abdominale+pdf PDF link annotation
    • http://akinmedikal.com/uploads/file/65048921402.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/votobopubimiduzomozazomu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/muramon.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611530fbe3998---nilavoga.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1308e70e2---gezimexugibub.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/71d732c8845cbb50599058c382341f02/zeludabireb.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcd4f16d1---liruf.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/guzajozoti.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f0b2d5d6---josuxolilasusajepi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/15ufnb0nc353ofu6b9492kojs7/nonupovozunusinawiti.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/41962745861.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19508828171.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234463b9e5---84187846059.pdfIn PDF document text
    • http://darstin.com/userfiles/files/27760433777.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27d677bc3675cac29234ae025fc9a3b8/vosipuxabezej.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2e50c2f7b---fefopixolinewonuluboxara.pdfIn PDF document text
    • http://0930actress.com/files/files/kafitali.pdfIn PDF document text
    • http://lactopad.com/uploads/files/58752753629.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/33770221026.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/34637185304.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/92472724238.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/18288183379.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qaem543e51vfe9oekols65effo/13952811319.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d911ddd46---worolakejorimorevugezized.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///93979919045.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_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 19392 bytes
SHA-256: c8d9c127f018827ef29b2f842cd348975dba8575c8feaa952b6247346c3cd3dd
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 11284 bytes
SHA-256: 29f691d7fb1b5878c6f62bf260a0a87b7da5af38aec7a5431555f47c2141f12d

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