Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed643d144335ed0f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 11:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a77def91643331bf893131935d0161b3 SHA-1: b626c0c1846659631482c0974378cdc05a6d9d98 SHA-256: ed643d144335ed0f3750aabc4d6e931742f7bff1a06f56b72d8addfa82069f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.armstrongre.com/files/files/52020173850.pdf In PDF document text
    • http://ropesadventure.com/d/files/kewawonupupavamiw.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4eb23d77375bb2e277c1f4b40da10349/loxiwodovosetoj.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/80748209501.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a07c218346---72172594786.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/pekezilalud.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87286298007.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/pises.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/jowuz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/683a5229e9d7e66e6ddf54437cde052e/sexizinasetasaxixegelofo.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xawegesutubirujavubudaz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146664a17c8a---gogaw.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/lokugulagoxejeb.pdfIn PDF document text
    • http://laserinnsbruck.com/static/81129858444.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/tiwuturiwenojurunojiliv.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/74056243856.pdfIn PDF document text
    • http://nemalipics.com/15463344463.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/bokegotimodi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/29932110007.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c659dd9c---12247901522.pdfIn PDF document text
    • http://learningkey.org/userfiles/24233052122.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/27510761117.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/36025033111.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210929094348.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/zevose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+k30+5g+global+rom+free+downloadPDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 17376 bytes
SHA-256: fcc3e5d7bbc000c662cfb8f1c23dfb7e387beaf58ca1fadf767f2cf63a75e5a0
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 11224 bytes
SHA-256: 7852ddcc7adc603260290f8af00325c8750c384cfc89f9982a3d0723be59e957
font_02_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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