Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a941a272015c64…

MALICIOUS

PDF

85.7 KB Created: 2021-08-05 02:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62124a8d17cb67f4bb3a17a828529a2c SHA-1: 3e839007663eec608d76c5fafb40ba2f5e19f725 SHA-256: 63a941a272015c6439f6dcc37a79829682b1420764e01e8f3ad5a18c40847a53
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external URLs hosted on compromised websites and disposable domains. The presence of embedded JavaScript and the link farm structure strongly suggest an attempt to exploit users, likely for phishing or to download further malware, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=why+is+my+air+conditioning+flashing PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7d2f11ec2f9573fa13a56550ce74680e/wezuvafipavaparike.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v1kad706ceuj9sf95th6560mi3/21256904439.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/lufivo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/83073663864.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6366ipesb9l93ehbq0hjisa43r/papawisosivuvevekelu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/97593102003.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/55310726899.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/3573618344.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52ce7834a---84468329509.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tubidebe.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/188498698.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/levodogetaxubefexorobiw.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/81679627250.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gr0ld4ibo17gtbill3r361dnmj/gokedenesuradenanisugen.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/sozugesukajobaso.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/70269666259.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bagosawutoxaji.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0673b2fab---37276656549.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/35434423984.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/rejelit.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7u51psed08h7mfb3uhpmk8vpu3/47474890270.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb5ad1d542843a65879b1fa4a3760f57/8516666862.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16248 bytes
SHA-256: b21acd68995c83780f05e5e1ced3eb515e386dc7393f6bd36fc8fb5eb27fb8b9
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10900 bytes
SHA-256: 2367fa2a726d32306beec1e152c681c3aaa51e120d80337445905270ab18769f
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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