Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed691a3f7caedb84…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 18:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6a20925edb72c0d91c7b3bc9ad395d3 SHA-1: fb179c2dfd79d1767f0b9ce6f8be0e8ee3e5c665 SHA-256: ed691a3f7caedb848509bf3fe4a0a124274aefde3e07a74b643d4467d692b68e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to phishing sites or further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support its role in a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a59a62f41edc337de80c9c081e135ac7/8571469397.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dedfe4820dbaab69fbb7f00c15194bac/tomakipoda.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/8173328523.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/karateduwo.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624532006.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/70447698124.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/19746147610.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bf6ae06c---4927404876.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fcn7n1udckmfkpocec65tt343i/50447377350.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/93231542200.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a32e696bdb8b336c2b44bc66183c9f8e/sejuraledazubemamenagip.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee62e423a---92019935368.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fegapanezuja.pdfIn PDF document text
    • https://subarini.ro/mm/file/govopiboxodamesa.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/71115349371.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b1df74592---93463747386.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c47ad394b100252fad52111be11f6e8f/52056745826.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210623104842.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79202687479.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/f0dfec04999b61645d26c2f193f31a94/ruxaposafevuvodigom.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ec61f710ed45911e8c05437ed409493b/15309075091.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086fb4385272---bakakegugijukugulaxuwix.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/89caa4a4545085bf5677a5a14d783dea/mirolipudazujel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+power+of+now+in+pdfPDF 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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 17300 bytes
SHA-256: 0c51782fb1390d5cf5fd8ec72b109896af8cdd0d8d0933775a33b652c2b2d7bd
font_02_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 10168 bytes
SHA-256: 8322ac4fed06fc02b2cecb5c3ad3e6ffce6408f2564bc8b038e05a1127ebfe17

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