Malicious PDF — malware analysis report

Static analysis result for SHA-256 0219b62fdc7f2d50…

MALICIOUS

PDF

140.3 KB Created: 2021-07-31 13:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f31179dfabb731b5c8891b651b4fcd1 SHA-1: 305e566e9507dba77b7e94b34044e9c89c0c4e82 SHA-256: 0219b62fdc7f2d50277484eae063cb6ad6ad5d7749c63634204aa0454a850155
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains and WordPress upload directories. The presence of numerous URLs, many pointing to suspicious or unknown destinations, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://rauvuonsach.net/images/uploads/files/80583385600.pdf In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a5f44f7ceabe6864e356efc1bd73d2/54469244688.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fngneni1mdrrcpeti7orp4bt80/20710294856.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/68345315828.pdfIn PDF document text
    • http://ha-sine.com/d/files/9567092786.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tdjcjqi09gvjvcmb9iig5rqesb/taxiwofogamelivujavupi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b3e071fd9b9fc975f13a6e414c978b8d/18588130753.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/24212026038.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/35537210379.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f836ee92a---witobiribumu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0cb6ff370e012eb547659581d9c1bd55/wuwovoveni.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d743d49f6---95089598180.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/40984349020.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc649a4ee50---83114248389.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2987fea531ca5794c31212836e435141/ximipu.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1bbc2f0c---vibira.pdfIn PDF document text
    • https://afayl.com/userfiles/file/4865968779.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9ml8sfgbnp9korbv4427c0jpff/paroma.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/6507925571.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ce7d5e47f51b5cb873a770bc92e266a8/91492272431.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/20839818812.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/65306374537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=el+asunto+serie+criticasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAD9 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C01A 19568 bytes
SHA-256: d31770c2df3b51e454d439f6f43378918c212c96f8c0f007eccb8aca785e1c03
font_02_sfnt_off0001f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A22 10308 bytes
SHA-256: 926a880c3980ff29bd99ba87c3f476ef2e1e93a4093dd1a97159176cf2430320

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