Malicious PDF — malware analysis report

Static analysis result for SHA-256 962ebfa6b63e29eb…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 07:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89634e8e9de9cfc4fd4d8b78450e677a SHA-1: ceac8752ac77c169e4c5f0900bbc75202c6da45e SHA-256: 962ebfa6b63e29ebd9ea4f2e5495b872878900a5a6733c1cef1efd4c6d554d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://contact-house.com/fckeditor/upload/file/78414571592.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bea46b58a21---13328775336.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/gavuvitudato.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jolademuvepebizinobija.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/525b7f78b1d397ec2a284bacc5d7efc9/93133953328.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cvfsidpo3uitjuudh921srhrr3/91523854646.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12b2c0a19---fofuxu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9cc0bd636---binikolojabapug.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b46c4f02452b8b7fd33f646894234cde/94912384806.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0ecd0d6c65fce9b688d8a8802bc43be7/35868683978.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/novivoxolaximanuvifa.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/36915802592.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1838ec680---palulewu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160887cc37e34c---pufukizegani.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/lokasul.pdfIn PDF document text
    • https://trieurodata.ro/images/file/29464619697.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tidilizowef.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/wijulabalamisufeboge.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/rafujipanenokubeketabe.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099218b79a40---diwozaza.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8riulophe7l4d9c85i59d6d5k1/73787444692.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/ketiwaniribodabemusa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730e9b3862b---15385873386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+de+escritura+para+preescolar+2PDF 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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10736 bytes
SHA-256: 053df37b2e8ff7ac98e999cca0fdd80c5d4f18a2faa04772ced3314194330b96
font_02_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 18108 bytes
SHA-256: 68158b490063b3768fd47f1804039d4c8471c8923a00117227a48f6b38be4c22