Malicious PDF — malware analysis report

Static analysis result for SHA-256 585cf4a0bf0258e6…

MALICIOUS

PDF

94.4 KB Created: 2021-07-27 14:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edd0b47c5cb02df70e5005bbef8f699e SHA-1: 2089880795d767ec71d5e31807df613c10aaa1ad SHA-256: 585cf4a0bf0258e627ee05e54c460844568b97905c11455f310f7c35dab40bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of multiple compromised CMS upload links and disposable hosting suggests an attempt to obscure the true origin and purpose of the hosted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/032e89f77d72abeac2c3e4e8cf2e5e09/63265387805.pdf In PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/wenimegefajan.pdfIn PDF document text
    • http://deauville.ru/files/file/7934933255.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/vupidulebanozun.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed14334708d---sikaxoxefemubibepuzezu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098c17b933d7---97405114985.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/39714397005.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a2omqopscebes8113u76nklru7/pumijisebu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/82375508092.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/77847052727.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b559bde77b0---liritilafugaf.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fa4n4s9r1opbtrbabtp0f28m83/46901906197.pdfIn PDF document text
    • http://amdind.com/userfiles/file/ratifijodokepalokare.pdfIn PDF document text
    • https://datajournonepal.org/files/64123391861.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da3963aa3---46389015323.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210521/210521195630055851b3mtjligef6m.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ae6fedc28---tumus.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/07/file/20210707_022657_190.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tajukedezugaligizupofesi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/33173ed6f6e25f672ed7a63c9a4e7885/88652883318.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/limad.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57da1c888d80c095c941f2bd90599567/zemaxoweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=leccion+de+escuela+sabatica+en+power+point+cuarto+trimestre+2019PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/134033ab36682227e7e39447d6c25a6a/wotixuzelafekutivivisefis.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_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 22436 bytes
SHA-256: 0eabe09232c0a33b9ec8680ffb2289d8f096a241f7854413e22e2469cfa475b3
font_01_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2C 11420 bytes
SHA-256: a2d26cc640efc88199c24f69c0461fbb1db6b588e0a69b4083fb9750b574ce1c

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