Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d52fa181351223…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 22:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94104cf785b789a9a784765bee406e58 SHA-1: ae21aced7bbc0cf829caae72ff257bc230258f90 SHA-256: a8d52fa181351223923382635f3ce7dd3a8ce7066f3c5f50a55158f9982f0680
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, specifically leveraging WordPress upload storage. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b617a3c3---83754084448.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e48c7216a---73732215183.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/99968686565.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47307144936.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/jirakipakiruwalowofu.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/70217823608.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56e88a1f5---64325894770.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f37178da---lupila.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/17063958787.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/93774302529.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/leniguk.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/zepebomisob.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/wetepuvezawaduxofudukene.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf4878186e---mojifigoze.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/jugakavi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/32329136152.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/62539139445.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/21/file/20210621_051615_182.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/33009881172.pdfIn PDF document text
    • https://auto826.com/uploads/files/lexexavolozufag.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/60892928941.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/44933330696.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc5e6645e---xisixejatesapuvavuvofoni.pdfIn PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29f594cbdbb142d986c5dd1496f05cbd/jubiwexesabokipivojetab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lake+bled+redPDF 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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 17848 bytes
SHA-256: 5b66cc409c428f3c69e9382d46ec082f5d7416266b4b182bb7cacf5ecad57508
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 9848 bytes
SHA-256: 63ab4db5a414d2a514d7fd0bd060c26cf7872259ffe15952044ce469eb878291
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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