Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65d44a07525293b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 15:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5795f3c2ef4edb73902aabd3735baa2 SHA-1: 848c5acb58fec47568149f8ab5b2986cfda334d5 SHA-256: c65d44a07525293b6c680e8b2c15a8743720d54a4a13b5945ef437c8831c0283
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=examen+muestra+comipems+pdf PDF link annotation
    • http://soupworld.de/upload/file/53965966079.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/vewatovelawu.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/zafexusexiwazodexugofe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1d41f5b74db064387dd9d05dd0be59ed/vujavitetorinataseji.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/nobunerafusuresoxop.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/82816307357.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb711dc4f7---vogizalidiluvikezisoj.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/sawasojosarupufaxited.pdfIn PDF document text
    • http://dury114.com/userData/ebizro_board/file/bewamipopiliti.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/maroxesigilulekar.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e6573eea90eb771e079197541061795f/81664131685.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210909_065846.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/padibuxipu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/podelexagokotum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6b235b3d---nolusobemukuketuripifo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/14538988806.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/79521626923.pdfIn PDF document text
    • http://gaudi.tw/upload/files/60633846820.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/54929899495.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pefuxij.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/wazawa.pdfIn PDF document text
    • http://praguetransfer.com/files/file/maziju.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a1a63ff94---zizufugaladidezi.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_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 10920 bytes
SHA-256: 7d4168363d520bc836cc73409dc2d87f88d6fec5f005d2f44bf9eba25f148cc6
font_02_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 17628 bytes
SHA-256: 2c880f34b5eb792d4d00469453968db1717c95258d3a92d90fbeff70644b0969

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