Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2214b3069624681…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 21:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a19912642a960e3c1ca4c912167a6ea8 SHA-1: b15df4210df27683497e92cb59368d7b98cd3241 SHA-256: e2214b3069624681317abda09369bc45798f92fc6bd9fbdd984db0c72e535c97
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the structure of the PDF suggest it is intended to lure users to external sites, likely for phishing or malware delivery. The presence of numerous links on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://coretry.ru/uplcv?utm_term=tamil+new+movies+online+streaming PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316226d3657---76290808790.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/gapipuk.pdfIn PDF document text
    • http://liluby.com/upload/file/21737891787.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/zitawumuburaxemolup.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdb29794ce---zexalagesova.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/disipu.pdfIn PDF document text
    • http://svx.su/ffile/file/sunorula.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/jibugaz.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/33911216644.pdfIn PDF document text
    • https://fong-cai.com/upload/files/rugoredipapenaxufudelixa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5e5c9af5---zitanemikifewexixejixoniv.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mmf0gc91mgggh9sb23rmh6bqqi/pujatesumab.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/95939977412.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///33517379827.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f2a8aa8de6a0d343aedf9dd3df5dfc52/22833590835.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/jowobojuvadenuzo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134228605d27---naruwijoximevoxesij.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/47743335880.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/10986779155.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c81f186175c044baff0af9fed086672b/66606095932.pdfIn PDF document text
    • http://webbuilders.com/files/file/malob.pdfIn PDF document text
    • http://goldmustang.ru/files/files/jukosa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sazawidijokojakot.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/jarobebur.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10568 bytes
SHA-256: 934dbaa05cb14ac467bb7ebc991ae652643044f03e292d3d5f6faf8bba9c224c
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 17532 bytes
SHA-256: e7ca5ba24c91205ae843162d50b9841f6c816c1efb3ea8e39ef9b68db1ffac3f
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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