Malicious PDF — malware analysis report

Static analysis result for SHA-256 509486dc4dd0f001…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 19:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 098bb397822cffbf67fb60637347463b SHA-1: e80d95a58ac370b9b3c930fe0854e9672d1489cc SHA-256: 509486dc4dd0f0019e43323bd6526f59ec2b70581044bf4e698e91bea0d9a9f3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9402736d3---tiboz.pdf In PDF document text
    • http://techbis.pl/files/file/motikezelosokabolibogo.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/ruresofutalibixarebakatun.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614418f81ebd5---69434057178.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///26397466801.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109080853169643.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/relepunolowevojadev.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/likezikix.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/wuburawotawuvomojile.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/foxaja.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210919_172704.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/77965744751.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/14854786450.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/76005364542.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/boxamuza.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/77681000138.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/pozironu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72053280405.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/25367095890.pdfIn PDF document text
    • https://5uempat.com/contents/files/pixunixelifakexizo.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_15ED8B5CD4CDD99F.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/84694222495.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a5bebf6a7fec5ed23a25a682b4b14f3e/86024855138.pdfIn PDF document text
    • http://fabtur.ru/upload/files/67420463902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hanuman+chalisa+reading+in+kannadaPDF 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_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 10780 bytes
SHA-256: 41baf9b716fe7108382dfeea21956fcb71da1f27e493fe598a6bd6ea68d68417
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 23084 bytes
SHA-256: 4790dfea176f29475d3d3da679ff3d8514f8e7fa0a956981a32e21559083622b
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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