Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28f9a1ff712df0a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 21:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2efdb5b77c859879b0a41ccc6a959cbe SHA-1: 5740de3c6401681e096d7220a072c56aaae40a14 SHA-256: b28f9a1ff712df0ae9b3851b0fabc99396d10275420e182293d7d519f004a109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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=is+fried+rice+bad PDF link annotation
    • http://atenngo.com/admin/sites/site/documents/26122226491.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7325dd758---xasofitujujuvowul.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607929811e918---90386578914.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847341a7be---dawalix.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc2b7c0a2---30585344141.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/10424406845.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vodozewobititatolekewep.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/fusaro.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/rezulijagubol.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/on5p10ubq931k61l61619cf0bq/moduligatexo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/bototikavefediropizud.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d81279f2c---12438513333.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2085c06e---nubewizevaxaduvawifuvob.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/70641147377.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41f9b8af0f---disiridozovibixela.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b269bc07fd4---89213668409.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/duxazotebumefom.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e907e6a884c92b590473201feb8d2dec/soruvaxexegefipofixanewad.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/29008855943.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/75430826186.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nelizus.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gefatov.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d38f9c4b3def0da3f612d1729648ab31/45084265105.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/keken.pdfIn PDF document text
    • https://yellowstonewildlife.com/14326135256.pdfIn PDF document text
    • https://digireg.ru/upload/92789483353.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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 18116 bytes
SHA-256: a5ed39640dc10e1b51593a3d95a63391da886a01a5f6ba1221544e2f2405dd8e
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10192 bytes
SHA-256: cab3ae574292fc89a15c0afd3e3af90202c0985d09d4b4e5ea802acbb24318d5
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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