Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed355ba1a692e457…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 09:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e06a01f36b3748a1e02adb38bcdd408d SHA-1: 56d56473cb22f4e296ddda7708d93b9e0bf2a0fa SHA-256: ed355ba1a692e457425dbeac391bbafdb781abb9e206d95fe2aa89a6ee871ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, further supporting a phishing or malicious redirection scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=redmi+6+software+update PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5a390960---dugupufasipuvatefapowubig.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43e2b3ae---39227961276.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/zemadalogixire.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/fgt0eoe09bloq4tq99mtfsll23/52054717950.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xubemurexofera.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/nekowusimigedozewog.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/78762332036.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/94522118922.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/82412362709.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210912192804_s30am5.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/88794881873.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gapolexaniwugasew.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613575dfecdc4---winikew.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/kunezuwamiguwu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd98aeb9a4---todogutegik.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/61426204251.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38d962338---tuxuv.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xefidovugivuliriduzan.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/57529737348.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140689d6d104---12782671893.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/solasaxege.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_off0000bec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC4 10908 bytes
SHA-256: 7080b485388e51d1d99b4155e2a32c10eb824e77e95c321bc1ce47d9d80a8ae4
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 17228 bytes
SHA-256: 9a672a841476de7619f5dd726d32b696ef95e8f239eccee54b8b2c4ae31a8630

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