Malicious PDF — malware analysis report

Static analysis result for SHA-256 49654c2886057b99…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 12:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 74d94ad394fba684d7af212c4cd6f896 SHA-1: b45c5465ad20397d1c2a9dfb88246bd20eaf8fb0 SHA-256: 49654c2886057b99d39034649b8ab31e98d0a9c7c8623c0655b22486b8996501
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=android+opening+apps+by+itself PDF link annotation
    • https://khachsan295doson.vn/namthuan/images/news/files/7743363148.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/28632564401.pdfIn PDF document text
    • http://getvisa.ru/images/File/50515412635.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/kuvewifovotubuwixoxin.pdfIn PDF document text
    • http://bamor.org/userfiles/file/4035445446.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/ludaxamimebu.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rududuj.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/21jk2onkr3kjtl05tdi8jrav0r/bejag.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcc0125bd---15376238471.pdfIn PDF document text
    • http://kotolantopeni.cz/file/sejemibixo.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/90554924789.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/1817534327.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/2525426475.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/makonofeni.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210902_110952.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zomulola.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/94021641744.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vasunujexipibenatodopiko.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/kamab.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6agecput5h5c9v4obtqv0ea28a/27569925394.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/xilatiju.pdfIn PDF document text
    • http://www.agot.pl/upload/file/vasaputugoxe.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903031738.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/61068470314.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/76da350db977cd30ba0a16ac0ed833b4/39416774971.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/sabikiwoga.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/52599063732.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 17672 bytes
SHA-256: 3a82d538b6ac0e8dbbf368ca680221ab84d5d8eaf96463bb0743a96ec441b7a9
font_02_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 10908 bytes
SHA-256: 832a69a3dbfa2687c3324c25a0da1b6e12e58ad4931b7626cad38c6acaa80629