Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f32b90b492c812…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 09:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 383037de48d776623c7d98c09dd15130 SHA-1: 542941f530c70add5ac2bb04152aed69fd099862 SHA-256: 87f32b90b492c812d4a18f3ad0ecc7601feb7b2c2e752cc9bb15e5db73cae242
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to redirect users to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://1careglobal.com/upload/files/suwikibapavinexixedu.pdf In PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/wapajidevamavejesem.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/nekifajimoveni.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/15407316631.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wafijeginokasexoraj.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nifosaforefoxipevolivu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/petabasewesotaveri.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133460fb48ba---4354102252.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/bejekesu.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/tasagegajakefixenerajix.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/kibewuwosewigenufaxa.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/56047338941.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/30724740867.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/71209969110.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/ponurererixepug.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lijonakobaw.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/pokewiz.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/juxezipifituwitizodibo.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/fapuwi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s85g321iomhoo01t3uj7vnsv75/finatijuvokuxa.pdfIn PDF document text
    • http://www.moyekolodin.com/files/motonezapamarimavirape.pdfIn PDF document text
    • http://wirheiraten.de/images/file/rufisujevirodu.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/lovorugo.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/talonoxejafiporape.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/samozato.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/87764ba67b0596747f85a64fcc081335/17757718129.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/radera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=client+server+architecture+with+examplePDF 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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 10904 bytes
SHA-256: 064203e9299be1123fc9b6c5909d35e608cd3d9bb216081723dfd55ffe7acfb3
font_02_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 15504 bytes
SHA-256: 9eae8d8a70658a452bf9aa9a50795aa655fe40258751cb0bc5c9cc435c36d795

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