Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2833e58ec3ff88…

MALICIOUS

PDF

81.7 KB Created: 2021-07-02 23:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac6364a0688407f8941080612e9a2035 SHA-1: 7c22a9284994be2f14d47d5b42ecb33272f215ad SHA-256: 1c2833e58ec3ff88ec32c197b09fd77a97129fa9d67a571746ba283fd781bec6
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing or malware delivery document. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, potentially for further exploitation or credential harvesting. The presence of numerous external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://pistant.ru/uplcv?utm_term=young+og+beats+free+download PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1a13e8d622d4c8568b8836a64b9e66ea/61801050796.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bf7bdf1468e341c140aea8bd76c7ebfe/51864793724.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/musefugokobesisexa.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfe785a8e---nisifekuduburuxemotuxi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/1021279853.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/n78s5hh8jkthu0n6qgdg0g8hsf/jurugirusogexefuj.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778cf9bd0cb---kufogovuxevamerimex.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/tuzukomokukijex.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b69b9262c9f---kokeser.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/75692203858.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/repurufemenaluzekedi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/1pl9p9jmqi2nua13br5goede8j/22833233977.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tfcctohfhk4e567h6ti3kv4nj2/vegovemikotogo.pdfIn PDF document text
    • http://texmet.pl/userimages/file/64179173960.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/815e36b5daa596e836c4c380b3807dd7/vurexowapemi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/71133710118.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dt9ne9flolrap0hpm8ftde2t7m/8209252546.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160921ada16580---72786563878.pdfIn PDF document text
    • https://mojer.bg/files/37092804771.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/h4tg4b51dkpohe4odlcm3oe1fk/kimosurajesiwonigex.pdfIn PDF document text
    • http://fittbikese.hu/files/file/gonuvagizotujaga.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecaa607827---xubomewin.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sigidizano.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/94599857616.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nazuguzadinidelizigijugoj.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/nudavuvabalefovadapabi.pdfIn PDF document text
    • https://kristinanamaste.eu/files/25253631680.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_01_sfnt_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 10744 bytes
SHA-256: f5949dc9a31f53b065788aafae3f8677b09ac3bed5740fd61b76f9c22f30079b
font_02_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 17796 bytes
SHA-256: 7bcd88c078af22b74a4e35891bf4d27c13599da128d6b7aa6c90f83a34e8bd2a

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