Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a48ec048a0210f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-24 10:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d9f7c050baedaeaa2d6ee62445d7fd04 SHA-1: b816ade92d151c21c13dd45e8bf3b9cf94118ac5 SHA-256: e1a48ec048a0210f5d71d6e270def9d1e0979941483f472a647cffb1a6311e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests a phishing or malware distribution campaign aimed at tricking users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=limbo+emulator+windows+7 PDF link annotation
    • http://emke.hu/uploads/ckfinder/userfiles/files/bomukazosemifumogiduji.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc721805d5dc7a54e716e411cd335a81/11178573483.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/30411794299.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc2e96b68---10995990989.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pavunezalufesuj.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/72831284423.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/43697827644.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/40148035792.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/siropori.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/lirisopasodomumebe.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gd6893uok8fgnajhdv2t9jaghr/jabaz.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161480540c47aa---98370799818.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130e36df00f7---jitakesopuzem.pdfIn PDF document text
    • https://olterus.info/contents/files/sibevovikexefode.pdfIn PDF document text
    • https://estoniapools.com/contents/files/bakusosowomivefasuvedamiv.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/59341401470.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/34024314162.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/62771501086.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613464fd0a4c2---vovarividigurenobaz.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/4999953646.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/050708249813.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/60419351800.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/surosufixapux.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/11446619401.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e960dd6ba---rupiwapibaxafik.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/nepoke.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10744 bytes
SHA-256: 07b28affbacae4e06e25df3d9ad18832704f87a2d904d988e0cbd320dd228ae6
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 17832 bytes
SHA-256: 50cf7ffdfc1a293542a3516cbf624fe9f866960327f93bdc4a43123d4639672e

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