Malicious PDF — malware analysis report

Static analysis result for SHA-256 824d84ee564d4339…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 17:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b54475f6ef21dbefa9f4ce4fc1e435c SHA-1: 92a984aea130151539f9ff1673e8dafeffa5dd91 SHA-256: 824d84ee564d43392cb7e2774ca7cb9ae25d42961a629d35944a4238be9b4b55
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The PDF structure itself appears to be a link farm, with many distinct hosts and disposable hosting patterns observed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://patriabrno.cz/userfiles/files/tonev.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b4b9259121c2ddf0603a1fb57c7813b6/52833756314.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e679e86a8daee9099ce11ed490afc0ce/vuvoneduwibidiluvebedi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/93a1ec7d3f5f708e1c4b542a23f111be/82719432508.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/tegewaxojolomalez.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2f2e7fcd5ac9f3ba991e6a211c4daee9/xabitisasejodipe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/88cc54d8538f1fdd1d2838db3c71f8a3/pilesenananufodifotimifu.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/gakojawemixagizomewimelaf.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1135b418---kalurafo.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/58502208677.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090be00d87f5---nituruselupeno.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/63843952018.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/49d9f16dbce05935e07011f8c55f1fc1/71964229903.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1bbb902af69cc2e6b9a26c4190744ab5/19123238737.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/71909495180.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ege709dh5kv6vecporusrb1tdf/77294648286.pdfIn PDF document text
    • http://safetypath.net/cms_images/golofurezosutumepa.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/18526241307.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fdd7c194---43645130827.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade89d2a13e---99230932904.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13076babc---renofemikej.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/ritamapakasawena.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160823d2e4af7e---nibixotum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rapidly+growing+fibroidPDF 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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10660 bytes
SHA-256: cef2903423bf96249d5b50fd45f3b18556729ffc693a57e55ebdf784798f4c4f
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16364 bytes
SHA-256: b8f7d9b040786d22736efd8172c2728ec5a0dcb6e33db699659de22dc132f4c4

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