Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0eedf26cf61c0c1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 04:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae705d30b5db7fa0251ada51f6a8183d SHA-1: 33cfb0d74354bab2a095184a5309270a27207a0c SHA-256: e0eedf26cf61c0c10c3fda0021f9c77b218d099d9d81c7bb319591681c644a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://chcial.ru/uplcv?utm_term=who+has+better+security+apple+or+samsung PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a8ad9709179e06e2fe89d6c3f8117a56/46730330806.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161459ba80f682---tekubixom.pdfIn PDF document text
    • https://km2804.com/ckupload/files/30350717573.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85d615be6---21901012131.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/watuzaku.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/42486005181.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/5961192580.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69726750639.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/xigomus.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/laxotufomakurasuluwudifar.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/39698503130.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/vutidasixevapufenalupu.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/17720883693.pdfIn PDF document text
    • https://senfina.top/uploads/files/22689586899.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385a5486e6d---surepoji.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/jifaligugolodak.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vilewogegowub.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109111450067808.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/88531282020.pdfIn PDF document text
    • https://flyags.com/editorResources/file///16541531878.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 18180 bytes
SHA-256: 82484779cc0f4142c225eb6015cb40ecc5dfbf9752f1edb674e85a3cd62f3aad
font_01_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 11168 bytes
SHA-256: a55f7f9b18946315e305d724b065c38ccf018a06ded52bbf711768e6a12706f6