Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ec98a6d51a07f6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 04:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d9f2f7b748ef83f395455ba8d4d9812 SHA-1: 8767444244ece988fd231564e5b6c903dd4c2e9d SHA-256: 46ec98a6d51a07f64fc9455046a5c2aca378aa18ba0994a0ad14908d37849f34
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://kartywspomnien.pl/uploads/assets/file/dafilegimopiwalex.pdf In PDF document text
    • http://star-transform-moscow.ru/uimg/files/27934683763.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/bifovokosutifo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc084bec5---robogitozobuziwot.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/19027506119.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/vupibanuxegiwiroz.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/62525118203.pdfIn PDF document text
    • http://ping-property.com/user_img/files/lubabivesavijomutofaf.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/sowazegamofajewodanum.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/85978413951.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/065d00c1c5f1f5c918c85b67ae18ff6d/bixekinalakuwomagom.pdfIn PDF document text
    • https://vanchuyen.pvl-soft.com/site/files/14208615852.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/gefoxudiduwukiralotaf.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/akddtlhi1635k46mmln2rqiuh7/50132977893.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109010825044257.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/42152219244.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/polidumexuxetedavuvaf.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/wexujatenigenezojo.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/bawefulosesiz.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/17642776198.pdfIn PDF document text
    • https://mollis.rs/files/38386844359.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38824035864.pdfIn PDF document text
    • http://vhz.cz/user-files/2563615983.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/17364444764.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/306574ebf301e986168dc5b2c91f6315/muzufumewuvoduwovitiw.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/memilavajejel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=blue+max+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 10400 bytes
SHA-256: ce76dd0dd6986194fbd573c2e87f36baa86a1d01f42db5032f6b5255bc77230b
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 16208 bytes
SHA-256: 6be17606d7b1c7adda0f6572ffbd19bbee0c3136e12e80f97c79bd954aa9f2cc
font_02_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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