Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb8dd2e33534c12…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 16:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb5e21b2376c7c31a5faae90b37ea169 SHA-1: 0a1a88d894b3f8ce4cda3a0029f3f41229722119 SHA-256: 5fb8dd2e33534c123361c95e8e4485574c890b6a2ab83deee8abd29d1959526a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://menlopark.com/wysiwygfiles/file/35123436619.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a2bf2585a---modawivof.pdfIn PDF document text
    • http://tuvanthietke13-5.com/webroot/img/files/josifotegofuvoregobipo.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/90934523392.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/viwoxedarojexolufelabi.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/xuvegub.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/nutuwakom.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/53392125201.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gkfn74vvmoi7vv18na0b7916c5/10659835156.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/zukuvedokoxugilinedaneba.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/44190759570.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3tikl17dl7ctf5683g2bdsumfd/danari.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d5050e6b52e4498363c6b2aacd1b6bab/bunipivefesi.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fazeviwoziritev.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/bimewozo.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sozolanakulut.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/xeweluxafuvogigowuvexojul.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/27524483130.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vetexukuwuduropakolim.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/tapiporelun.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9350ab8a---71947628952.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522173847191907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=5+times+table+worksheet+year+2PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e7ec77aaba25d1ac1e7bc07c701ee103/buvibixelexiledujig.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_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 18160 bytes
SHA-256: e72aa4ad2c77d1cac70ba5bd6d400a510fd8f27bcd7004548405a0fbbef58cc9
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10860 bytes
SHA-256: 1b1528ab03cd2a8ba4951e6c7aed05cea6bfa238b8797315eaefef8228bd2fa8
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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