Malicious PDF — malware analysis report

Static analysis result for SHA-256 2611dc595d2feded…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 08:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57c76634c31f5914e96edb2ce9e4ac2e SHA-1: 3bd1513891aeae751cb727d794ff19ec8107e68f SHA-256: 2611dc595d2fededb410cbae9a5dce2540bf339e7a04b1b2e746972215704108
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable domains. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://itineraire-consulting.com/ckfinder/userfiles/files/zetawitagisawemuda.pdf In PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/92864774295.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/toxanoxoradakupus.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/30696716948.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/21727440480.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/gawumororudi.pdfIn PDF document text
    • http://medi-sen.com/files/files/94492326338.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/bexit.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b5e1463---94986815120.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/19793068208.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/97708170215.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/akao58j56p3p4dhd3au151v2gl/43671478396.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904225445692153.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/pupixel.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/gosakopetatixawesil.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/lufosepi.pdfIn PDF document text
    • http://bushurov.ru/images/files/87307162694.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/9305570829.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/batulinisonibepun.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/6855329780.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/nepajuwo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87872c7b---68798013679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+download+music+on+my+android+phone+for+freePDF 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 11080 bytes
SHA-256: 460393617324c26f90404ef739f55af4064d76697c2bf05825160505781a4231
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 17540 bytes
SHA-256: 9309b5f8f6419f37e7a26e9c4e94604bce2dc045780d0b0c56edfa74cd14f0d8
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1