Malicious PDF — malware analysis report

Static analysis result for SHA-256 492a269af38b8476…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 04:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68d5aed44092f2ce390c27de4d1f2f72 SHA-1: 514678e82ec56bb5a1dd829aba9ac221d41301c3 SHA-256: 492a269af38b8476061ac46800cb4d9623220e6f0dbb49d43f3ffcde06fabb1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link heuristic strongly indicate that the PDF's primary function is to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=wrath+7+deadly+sins+meaning PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199da56b06---25651441471.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/48344681723.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c67e66cb7---ragivujivaritupedigox.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/wemujetujisibamufi.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/gomof.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/giwobexepezajofolo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6crjb35tva92se087sfivbqikv/50200287763.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608717fabd357---lunuzuvifozozubux.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/dawugajasuveze.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/sidaxuvomolojif.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/boven.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vepitokikibo.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wusadadux.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q38mrps7gthd2p9jpop1tac0r3/zotederak.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb65469cd---mepowebaxibajane.pdfIn PDF document text
    • https://hiroyoung.com/data/files/66991402973.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/34702780415.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/gatodewowib.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec15f39dc8e2f6e0777bbe0a7a9a379d/37373278956.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/8102024797.pdfIn PDF document text
    • https://angkagenap.com/contents/files/tevetuset.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/76899060e7fe600abd17a607c0ba4c6a/39129831077.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/75536115358.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zaxuvurefuzufagefe.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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 10732 bytes
SHA-256: 3de5ab9117fd14848fe8cab3b0c605e6f6240ec7dc9b6d9de8cdcd51b93c251a
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 18144 bytes
SHA-256: 73cacb815d9882e1b66b27de6b4ef470b45809d71a9ef1aad4346fe2ae3871eb
font_02_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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