Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4f3eb1e20c8b08…

MALICIOUS

PDF

75.0 KB Created: 2021-08-02 19:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f99c96099fb54b3f68c6401c21a5bf2 SHA-1: 97ebaaf6813522868c0116fe4776f4575cf713ed SHA-256: bd4f3eb1e20c8b08efb89ac684de0e39a393ba6bf1a6d900bb60d3b0493b1a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/72eb6e4df51e24190666d4ca7209ff12/levikimoli.pdf In PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/67749913576.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/vusaduwomomivimoxebu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a8c85de6---17184047901.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/kuburuteruv.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/176k0vn6dii74r74d8hj3du43k/duvotu.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/mebesitujekipovutesetev.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5f6e70f0b708e8214e0ad5633a0fc4e9/zirasugetanefateza.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/40511397439.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/20564889256.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/fcca0d5e49b4b4f278c73e5b5505ff8d/40060041828.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/83750034303.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7344d984d---gigiruziwitebule.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/68298588065.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/23917223885.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d69b62b8c1f---81093472245.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a50a0ff55f6cf798da73e8000da8e984/pezamurola.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/93fbb1c9b0b784d1eefaaaf376d3daea/limir.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052100481873499.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gidisano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=karcher+720+mx+vue+%C3%A9clat%C3%A9ePDF 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_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 17732 bytes
SHA-256: 34266232bff2e9a4d97e4fad0e62bb8e12aaa6126f73289927f800b3f15178e1
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 10716 bytes
SHA-256: 2c58a2371266f61b031563dfa04d597893dd40af0bff613105ed67b7d2e24e05

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