Malicious PDF — malware analysis report

Static analysis result for SHA-256 97852444e85a5988…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 00:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7844cd38565e1321bbfa3b4ae5e5a462 SHA-1: 7e33fafc8abf8883531ff8661b4ad570bcadfd88 SHA-256: 97852444e85a59881c73b82e5ccf93bcebb580e8774b7ae50e041cff07f19d70
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 malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting, likely to obscure the ultimate destination or host malicious content. The presence of these links suggests an attempt to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aed1763c2---1356748536.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161321101863a4---midupepisexogufipewata.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/56406481374.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/sodipoduvewu.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/23928366111.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/51850151072.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/31038786879.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72b754f27---mevow.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/zekedozam.pdfIn PDF document text
    • https://0900107678.com/upload/file/83857381420.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504fd5968d---senobe.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/zotipeja.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c918e383126---7264110552.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3723b79d62---85282007556.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/50881107816.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e67d2887d00f64762d791cd130ae7db2/suwetukiw.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/zibum.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/p30h1a09er6mlt04m1b42rvq1l/89947338509.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/90232162410.pdfIn PDF document text
    • https://peterdegendt.be/file/nelapinaratefam.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7bc95bf4e00566abfb5d5f552546b63e/jebudikutijew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hebrew+names+for+god+and+their+meanings+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a141f0e2498---kivuxutujukumafewamegige.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_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 11116 bytes
SHA-256: c8cf9c69e69f1f1427baf504c9baff0db4e27a3ac9c50a3fa39d626f9a4fd7be
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 17520 bytes
SHA-256: 648c8a68afe151ac0e61195eb8fefd7ebfe686dfff7d2c9eb34193abcee0a4d4
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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