Malicious PDF — malware analysis report

Static analysis result for SHA-256 870019c32271ef02…

MALICIOUS

PDF

71.1 KB Created: 2021-06-15 16:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 011946acaa6b2702446c5c3e8d141428 SHA-1: 92841b16fdf3a6b8545fccb3d25b4378bb686ee9 SHA-256: 870019c32271ef021f7348bcc477bf71be7870ebe87332f69729ba2a255241ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. These link farms are designed to redirect users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=happy+birthday+shabana+cake+images
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1bekga3j8us14n4oifk6mpjf20/17434975407.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f032bd0631---zateripijifiwopamor.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/107b826c511819544566cb747cae2a50/sejumedatesafukusumezafu.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608933b0c217b---fatepipatilokogenepa.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1996828aa66f1cf3121be1e64c03b055/zuzufosokutopapigakar.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8946642f5d---vukafulekusazixugedivi.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba30fbbd0d9---radugulumuzut.pdf
    • http://manixcnc.com/ckupload/files/durumijosorovuvagaledag.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fda8689c57792bb97cd65e8730bd8b78/xezujanirirolenopin.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d48c012---miweribakifasozuline.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qqjumcm71uu5j8d667dgcc8lke/31494079370.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57816ac5e9---967094529.pdf
    • https://troypin.com/calisma2/files/uploads/nedazupopivawima.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9391098dc4e8f4a394278b6f938eded0/monomutab.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dc96bb24a---gubefotujadujibanonulub.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6629215a53ca88096ad4bfc158f7c7cd/50366788994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff2.bin
e0ebe5c6e1ef7f51d9cbe7f8742b35a0cbf2ea7b0ffe83e94fed16e587ece9ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 5724 bytes
font_01_sfnt_off0000e338.bin
da4adf8123cd1d68b6e217dd7f99804b236e2aa40abbe793fce9547d111a1fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 1548 bytes
font_02_sfnt_off0000eb2f.bin
38704476779b9b264b2552d143696d7c77dcb3b75f0c3528fb757096b2938106		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 10564 bytes

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