Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f006b26cbbf0ed6…

MALICIOUS

PDF

154.7 KB Created: 2021-07-23 07:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a83395b06d9c1b35b1defc99fb1b2a1c SHA-1: 9bacb1339e16886f5a681988aa0d7e2eb8a7a78c SHA-256: 2f006b26cbbf0ed62fb694c6240b7a232f6027606470dd83c76daeab214eba0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9mabjctl45glqvh06juc5jqu71/17119650806.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0894b17a---78687106103.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767455c6183---16992593328.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/xoxulegodowubore.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/7790037096.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/difitugexelisogowuf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9e222434---93293331225.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4160f53b04f9a0f1c3339d2e8722b251/ridamaxinu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759d40f3430---78244958412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980f3b8a81---fiwemuwuse.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608648df91389---tetunutafivizelenibip.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruvuvitarek.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2f41ac859824ebcd9fdf318e436f1e3f/mizojanetosisapupizato.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ccf00fcba---45386205237.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078735498af7---23539800943.pdfIn PDF document text
    • https://jagominum.com/contents//files/sanofer.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e815a50b785---26625276035.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014838db8f---14742358321.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/dotepedizedibepovugezol.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/guwagiresiv.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/budasubezitobijen.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/84909079604.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/rexitisogipugifibiwegiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=5+facts+about+emily+dickinsonPDF 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_off0001f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000211dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211DC 11020 bytes
SHA-256: c1584444ce4a8b24282b4749921e3d695f87d6552794cf8d880847fb5e27cc53
font_02_sfnt_off00022b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B8A 18324 bytes
SHA-256: fa2495d9d3060c0ec68b0508eeba9cf0eb76662db262b79ca2bdd74fc447ae6f

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