Malicious PDF — malware analysis report

Static analysis result for SHA-256 54066b5321a1ef76…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 22:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cce605cb36b2334d7c673d14fab0f20 SHA-1: 61a9784984afe7e1dccce5f4eb8528802404d01d SHA-256: 54066b5321a1ef76c365e11274613c62e64491340df3d08f92dfa5f3c1beebcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=principles+of+geomorphology+pdf+download PDF link annotation
    • http://jlm-kg.com/uploads/file/49403665222.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975239665bb---xazivobudiferisesa.pdfIn PDF document text
    • http://totoumi.jp/upload/file/46273595926.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9krhrfo2528b7dnrer0uipkmd4/fozozaxafogimamolewim.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ac03eec7fe75187382943cb7752e6ac9/gebutitilovobosuxajib.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jofenanalomem.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/fezejolakomu.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/83595643210.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/likabe.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503063219.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/3987510787.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b81164986---40447837021.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf0bc0dbf---17320544967.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/91315104395.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141c9aa809---bepunamanovavigugebured.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddaf8049f1---wajorugikoxegipib.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/razuxufafikavofe.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc103efc5b---53112503659.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/54160757326.pdfIn PDF document text
    • https://ambalatender.com/upload/files/momesatuferudofizenoda.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a776eeab5---82558508203.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/8845867949.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3ffb1866---37795418246.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b402bae337e---52700047410.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/daxolejisogil.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/49087976064.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_off0000bb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB94 11172 bytes
SHA-256: 6fff649defe2de0e9012e5ef922242b0f7cad80a37d95a65120fcb2594300468
font_01_sfnt_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 15520 bytes
SHA-256: ebece143d03c665df5821134cea3e4a9cc68d0a75aede4d4e9a624eb0773e8a6
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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