Malicious PDF — malware analysis report

Static analysis result for SHA-256 9058120c34349937…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 18:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3585881463075e3996996a2efc2caecc SHA-1: 0ee264bb1f11827ba2dc5b0181b2e8f29545e91f SHA-256: 9058120c343499370b33ccdbe6181a840cdd138f0ef9a502001f1abed76ba5fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=gta+bully+apk PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c13d9297ef6bcb567adb764611d94594/83332788892.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f79bac30cb---36381489639.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109231251516224.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/cf6b8b18444b788b0abb4ee5d2df00ea/76139043274.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210920233722.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/rifirejelulalakodikufom.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/vexiperozagevozixuteper.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/32000832000.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/15976197233.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/2160257466.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425e045f397---pajanupinesube.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///31072535435.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/75400402470.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/womanez.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/16885028947.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/vinasalegofepu.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/74560089180.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/kepaxemebotuzaxe.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/vifexobokimilamijotubetew.pdfIn PDF document text
    • http://sireny.net/share/files/wulebatalolema.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614272093c4d8---5191943993.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/850268500.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/13335590336.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/ramiralikabowaxe.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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 16172 bytes
SHA-256: 7e1b5ea81ee5bd18915acc908b6d7f34ebbb3672ccebe2f73506aff889642e0a
font_02_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 10012 bytes
SHA-256: 29b361222d4fbbe683d41fa299432ef109ef430e3aaaf1701531983b39e30997

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