Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bb6fe0af74feb1…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 11:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ef47f303c93c173eadf8530ad336260 SHA-1: 8d93adf54a7e8a8cf8f463e735045e94e6160a96 SHA-256: 52bb6fe0af74feb1fddacd2697241113d996bcbc3adcea6f5a6fe05a91e2187f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms and disposable domains. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=cheiro+numerology+alphabet+numbers PDF link annotation
    • https://sunridgecorp.com/uploads/files/202109200233389199.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/fejizevizuvilur.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/89692117982.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/33429262612.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/sosoperev.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca0e7d857---10097807381.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614549b08fd37---rivigigok.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/wigovasubojonemagigukul.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/77251593673.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/86985640235.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/45645663146.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/dupabebegizexevinejure.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/gowadujasabedimigasapi.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/18298259664.pdfIn PDF document text
    • https://uudanbury.life/files/file/3448305666.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/pimebafiwefivur.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a11120d1e---nisutaxuvazijobedegapu.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/vusenipi.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/24925569033.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5jeml9fsqe7m7vao4vbf5o5ro4/18893724988.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/42092468856.pdfIn PDF document text
    • http://mweb.cz/images/file/70386518125.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/tibewosemo.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109200551134202.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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 19900 bytes
SHA-256: ce6b057c3cc2a0cdac8a352057b88f5a3447859022c60e0b9b7a4ce9402aea21
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 11084 bytes
SHA-256: 431440d80ee7cbfc0a75788012cd5eba938b314cb092c95057722c44cb62c428

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