Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3ea013129f0652…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1faa1687f9486c9b520c44288ca2f50 SHA-1: 97f5c0e81996f41593dab4fde8feeeccd11339c5 SHA-256: 8f3ea013129f0652d629030c8e2e0030d2a5258d81a447f7fa89263e82a0fa07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

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://crewmak.ru/uplcv?utm_term=anaesthesia+drugs+pdf PDF link annotation
    • http://taikenplan.jp/ckfinder/userfiles/files/lejaziganexu.pdfIn PDF document text
    • https://codecs.roimages/file/44478664997.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wezemepokesopojoliwer.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/112a8fbac0f9ad2a0d37973005a6beda/beguxavi.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/saxunajerumabenilupenuz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be4d4f1fe0---lakodat.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/90238111567.pdfIn PDF document text
    • http://toonesk.com/upload/luwinazunititudi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ed0e8f8dc76c95b060693124f92f44f1/fubozenixadulamojiji.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/varemax.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/2ifbhje20hqmce7rqa0tpldr94/56409369684.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f7817123050930686703dfaf042cf2b/14246986821.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ffada2f92---mesaxor.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/sowurogesefonutinexugetuj.pdfIn PDF document text
    • https://777mto.com/contents//files/73268725134.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/29848792210.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dibepukixonor.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/34753340759.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b9695326---21512733652.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/49969855209.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/44103802257.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/31575999665.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/79897001606.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d022b5c15b4124d7f22c8f371716c628/73059010500.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/90558950599.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e84604a3---vibelazis.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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 10692 bytes
SHA-256: 5314ec1abdbd9fa73d2aaee9e4b7475c8fd20ada9be7e1712e488e89895bb849
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 16204 bytes
SHA-256: 55d5d861588a86b5a1ab8653980bac8ff1a053272b6f35e4937d2f55ab5adafb
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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