Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8c5e8b94e6ad69…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 14:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ce593197bcea5c279b7a6cf74b953d8 SHA-1: 3b2c226e5a19aeb7f3d29c150cb4e24b3fffa5fe SHA-256: ea8c5e8b94e6ad693ed04876597d2a3cc05641bf1b9118c5fcad91690ad9db0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1f7e89eb---zojelesedopedoxotarufa.pdf In PDF document text
    • https://premium-house.uz/images/file/pijirivosonotasugogonix.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/wubujibage.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5nklfi67rc0h9vopvqhgtc3te3/buratibegonebetukimeze.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b7b2ba7b97f39a0f0bc81259318cef33/likoxosiluko.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/be3kea238fng3qvq49va4vsguf/71234944169.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/02a9284ad526e1d8d1e79619d39d52f6/nerarewaga.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8efea20c1---damosajukedunar.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/26564901037.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/rajunujajuvurilisojunaxoz.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xesonobesudun.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/28264034412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e94031969---zorunogivolelijigu.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/21602008267.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/emqpj97kg2g0gk4pd7a36k6ake/37884269176.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/45739697142.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d412428d3f2---30307201220.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609181c681e81---vesipadidezokarefe.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c414babe---kepavadetabojesuxujod.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e8093d62a76e0a32042f7aeab9a4bdf9/89759447867.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/wedul.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8cfc9b178---47081519767.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s0q1rli67rg152bk4h943n50r7/53924605980.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a64effe8b2d---3842600670.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a0a393cac---tabuwokufemewitaxesan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=my+hair+has+gone+yellow+after+bleachingPDF 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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16648 bytes
SHA-256: 0b2963426694860fe2f6b2979e0cbdf5ffe39a8a3a1cc994e2850f8dc941573f
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 10948 bytes
SHA-256: dcde5281ffe10c30d821c3ec25a9205692cb2e2b5ce05cca4e3959ac9841339c

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