Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d2e3c621b0202b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-06 09:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 119d8b5320b502c865bf4cdbeccddf8a SHA-1: 3cbcac006e0121d901489dde95fafe960b5d514d SHA-256: e5d2e3c621b0202b70b909de9580d22242f78a7c19918696001455e28b3982a1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://essentielles-theater.de/UserFiles/File/17830938381.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/51850530496.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/vipodimezonisomelovutesox.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/37328028836.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070216420973499.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/2418122106.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/28377546472.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fcf0388f---61393731154.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610df7b73c536---11991007493.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/waxuwunizotoguxuz.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/37065691606.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/vigatemadokamovajoxetaro.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c8fea18ee---xoxakudazirepabap.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/11812349900.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/boxutowaluko.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160727934033df---nazawuturoxovadu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/80883003031.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/94970376726.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c46de8c8bdd---98895425156.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/85567770030.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/womomobigokevizuwifatijad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=proceso+de+nixtamalizacion+pdfPDF 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_off0000ae04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC616 14924 bytes
SHA-256: e890db55a287ef8d41208ccc7de6333a7951ee125e0feba6ff3a18784fad0b1e
font_02_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10944 bytes
SHA-256: 9d1ec0c82f16cae60cc14ab7a1e371a63d464084da42b56ed96ce52317680780