Malicious PDF — malware analysis report

Static analysis result for SHA-256 debb5e5c8402f059…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f169e67ed41976831c6173c45c25e5a SHA-1: 4488218a650d3b8147e19c0c03b11d577582a99e SHA-256: debb5e5c8402f059af938844147a6ed827d1650f51b76fa2ed1167229718109b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves redirecting users through a link farm to potentially malicious content.

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://oniceh.ru/uplcv?utm_term=omegle+random+country PDF link annotation
    • http://blow-w124.com/js/upload/files/47481500737.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0fb90cff---xujen.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/23578352110.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/juvuro.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/velemorabaw.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/63522188673.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/80034623794.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/85696450695.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/rexibikidizako.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/560b0de7de84cecaf8cc65c28460ee02/tugibulirit.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tazevulavakeguzojejejopa.pdfIn PDF document text
    • http://freeorden.com/media/file/48338651006.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/ruluwefejoragadizoxomewu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435056db245---87843226384.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137454130e74---53372251205.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/90694203747.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/5184330542.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b53a8bb5---tudugadox.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nudusikiduvanuzezoned.pdfIn PDF document text
    • https://estoniapools.com/contents/files/vuzogamibux.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/14869973036.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/46462507310.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_off0000c37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 10692 bytes
SHA-256: 8039510c6c3380d185b16958aba76d725e14c1defcae893cd948897a8ddd7f98
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 18948 bytes
SHA-256: 473253076dda53376beed9e702487c449aac2c26083b93a9d62586211c49262e

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