Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f00e928c3ff8a6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-31 02:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a73c1ba8744b31c74de893761c68838 SHA-1: df8a2304f3c0f60ed12a92dfd7f28895de6c539c SHA-256: 54f00e928c3ff8a6d0be1bbaabb65dc11d24b2b802a08f8cc80ac98668b6b137
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3330dbf---70679701281.pdf In PDF document text
    • http://miraesusan.com/ckupload/files/92171565088.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8c0e71cddae05e9783080f7e910a1203/58396347955.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f5dc0e34ccc3a3478eccf68f96ea5de/figotuwiwanagivopulajenu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0212aa8cdcf56f131cc095ce7dd40322/53488927333.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c643ff841ad---dedewawewugajezitadag.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/farijasefoninijoteg.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/64480121443.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160802e6f07636---48930294292.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/rolelerivujidex.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/6437813274.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/36464694704.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc45367fc2---72436308237.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/riwoduveroguwonopiso.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/danojoge.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nemaxoxotuworexi.pdfIn PDF document text
    • https://strechybenesov.cz/content/11332435759.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/41865451618.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/jereko.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/sized.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a2ea9853---lurukibosebuxuligonezu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5807c345c---bemilikikixibagudig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pyar+kiya+to+nibhana+mp3+song+download+old+versionPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 11508 bytes
SHA-256: 2cde9fb1df9f7e93b70b8f99df7726cff913cd7954f2de09fe8d977956669f34
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_03_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 17088 bytes
SHA-256: 87db7c2af05dd8185c46e7b63a0e09d97d77aaba4bf0b8fa94350808cdbff744

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