Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc054285a7040ad0…

MALICIOUS

PDF

72.3 KB Created: 2021-08-19 10:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5b64da9d19b68a885ede4cea2f6b3b8 SHA-1: 8822de7d55a05bd28822888a748515c47ae31c00 SHA-256: dc054285a7040ad056131897f92abfb9b99cd6730754e45eec2d7d2b849bba5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=karek%C3%B6k+matematik+tyt+deneme+pdf PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd75375796---fubinuluw.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/18428166128.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf59c95f0---98739020425.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/pivozen.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kls0jbpgd97d5lp6rbf4cmnof7/pinuwuzepodaduworetumo.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/banegaxutorenilefotezejix.pdfIn PDF document text
    • http://cycling-software.com/files/file/rezegejefip.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/490603665.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/9731456588.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/terorivigopirawazad.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/18609227740.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7c880bf813c9f81dced2006793b6ee06/jirevuxelelokow.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/91230574080.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/25848163535.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/23786511067.pdfIn PDF document text
    • http://strandedtattoo.net/file/72226670839.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/1500773361.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc8565c0f---gelogufobesiwarivog.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/49122909754.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/70135675207.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d130b218d3---62864852676.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094da254dc38---59607418984.pdfIn PDF document text
    • http://spbi.cz/res/file/32531382689.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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 10736 bytes
SHA-256: fa8e3b0618d9a6649d4608512ff96dfea00cae9cd90a38f4b121a618dbe732ab
font_01_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 16396 bytes
SHA-256: 5c7390d87f0f641646de106523151d1f4d2325e71e42acb5a83681712528a2e2
font_02_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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