Malicious PDF — malware analysis report

Static analysis result for SHA-256 2547f9f7981acdb0…

MALICIOUS

PDF

101.1 KB Created: 2021-06-26 03:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a7b7f23fbd6bfd3b96935a5657da7f5b SHA-1: 347794c3b0f35004640a73dc02409b36bafb18bc SHA-256: 2547f9f7981acdb0edef679cdbd782a92e326bf61d4c750190d878f92c5c236a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=solving+multi+step+problems+with+fractions+and+mixed+numbers+worksheet PDF link annotation
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/205345961e3b7b281b22177d5bdfe06d/20635888921.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4f462d5301b834e41fa9d8ddc477075b/76808761055.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/1907372490.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160790ad6e6ec7---95565510892.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wapevavul.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1fd41e1b33e95218af912c0ae87b4f51/sitiv.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7d36a4b6---89906006305.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4b8e66bfc---62846351056.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e3bdcc3038614e1a4bb8941df56350c9/19962358718.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f4844b8f---70252958431.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/18250634770.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wiziw.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/puzamagumiwivibupu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kseefsb5knal35hngi4siiok0p/76714740981.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14088064499.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3f1980a0b236bca80450873c7994ec76/80919933873.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/50448663246.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/40858006053.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd4c0ac3d---dinagovanegarakifiz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f13953ca---44977316754.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/228c730e0e4371a55c2a63a4d0c49dfb/50877615665.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160943188144a3---11216054216.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_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 17644 bytes
SHA-256: 4629ca48bda6f25d93374f041a92df52d95c012b985b4e876291e4dc049fbdf0
font_01_sfnt_off00015310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15310 11728 bytes
SHA-256: 0583b175afa2f40ce6ad38d4d7ae79b61c91004cf596b6a63235f404cd32ede0
font_02_sfnt_off00016e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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