Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53be7f264c83748…

MALICIOUS

PDF

86.4 KB Created: 2021-07-27 17:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c6eaf2f974fbe135856fc6c4516c149 SHA-1: b999b9e034387c0ec5f576b487c421bebdb54912 SHA-256: e53be7f264c83748ce6108a374eeddbae1d335cc3aa2fbcb044753bab8112b79
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8b04fa3d5dd705bb9b15e0d367448340/fonigepuzafutolagefijopal.pdf In PDF document text
    • https://rhodium.vn/uploads/news_file/10259106811.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/34107082730.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/508f83b5610932a2b1291c622da9c4c6/68838093249.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zenusofawupot.pdfIn PDF document text
    • https://nada70.org/userfiles/file/35320201075.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gumupowusegadodilimi.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/jopanetudoleporadis.pdfIn PDF document text
    • https://brs.jo/userfiles/files/kifasutafe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/13mskpmadaq7g9e0n7s7bjiqqa/20278398871.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a007172f9593c56f499f88712d3e7e11/5445913809.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fb0b90f4f0d7c7def42f6fdad2148831/48795616535.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fb60b81c---85922165485.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c9a11832f6409e642ed26fd328e5e329/fepixi.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/20764486353.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3tbm48t071ovjrfln9ulccev5g/gifamumukadexixiv.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/55105996208.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4c45fd0de2b6a9edc27149a2f6a77f6/6561040884.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/wajamimodoganuzagexo.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/2849187551.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/15743905247.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ad2e7b18---meliputoritanadino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+general+properties+of+halogensPDF 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_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 17504 bytes
SHA-256: 47088fc1b9ba7849032ce834240c382c9ed2c797485eea02a808d06e58c74e67
font_01_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10632 bytes
SHA-256: 74cbc2a889227a223e100753a1df47060ecdfd4d24f87903c4f00c5ff6e872e1
font_02_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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