Malicious PDF — malware analysis report

Static analysis result for SHA-256 582a9a32a179db74…

MALICIOUS

PDF

98.9 KB Created: 2021-07-19 02:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4def95a69d7d189e7bfc0be945f4e44 SHA-1: 37ef61784c8c1f5ef007cbec7a48cd6a1c3f2136 SHA-256: 582a9a32a179db7495ca4ec070024323c283acbcba7d7fef297da43dcfc061d5
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 an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0amgjjg89bdv7b5kecg472d6e7/59433224263.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ou03hrbu26gglpcpoeq7pm3g95/solawixezuga.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/49ol00r4ls6fs22g5d88op5ci0/julumatuxekom.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a02f4ba1e---88214812323.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/kimanekifakigetizoj.pdfIn PDF document text
    • https://digiconelectronics.com/media/lanadasejakuvopam.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/43753836825.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/cfc9d8836e4320db3235f84e81619ddf/6148310299.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/8da851cd3a90d6e8952f03aac6620134/45035600959.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/vuzemekofimekotev.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zosinetiwisag.pdfIn PDF document text
    • https://projetovm.com/uploads/files/vazobazofuragi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c5a5aa4c7753b122682c376ce0f0f18/jinixomuzedu.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/92595050918.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073770e0d9c5---rakejefujuluf.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/10806349589.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3d0afd3fea2fc36ecdd432a41ff8db4e/bogavil.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd5069765---15289689113.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/90853650170.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/f42d939c9f312055bcd6705318525a00/8400239615.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/75489630457.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/62d8562e4b29c44ca8b88fe92b807aaa/nowutunazolitamisewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=find+duplicate+images+androidPDF 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_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 17672 bytes
SHA-256: 7dc2109879dc719eb00bdeefc7a0e76d1547f757a8dc4252136e934401790702
font_01_sfnt_off00014e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9F 10936 bytes
SHA-256: 4f57f4b6b3fa26e5bb030beeafb2e17431a6ff397254d46610b58d67008c8ea1
font_02_sfnt_off000167b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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