Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d482a3c0135f280…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 07:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a05625b3e55c66925845ab4bda27bd82 SHA-1: 593d281d4a6169854457a70d4210ce8842a4d922 SHA-256: 8d482a3c0135f280430fe0586f33e52a15e82ba12d14d2a69c3d9b64307d07be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://immo-macedo.lu/userfiles/files/tomixebazilofijikidimuke.pdf In PDF document text
    • https://sukaunited4d.vip/contents/files/vukuse.pdfIn PDF document text
    • https://tuinvandecruys.be/file/janibegezubadanokalazopuv.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/35322428208.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tajawuzivirero.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75a8912eb---loritoku.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/piduritodu.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/givufogajen.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/dd6f1b4ff7ebe616f189d2fe616b630c/rapaliwasunatakekinoga.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/9013201973.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230d21100d---22760268591.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sederuva.pdfIn PDF document text
    • https://afma.pt/site/upload/file/80330615002.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/kopozitaxanokejugegavikil.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/21030970491.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/leziluwazajukewemutab.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/rogexazunizazi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3738d69a2001fce32cf94f1f7375fe04/rutiwomoselanomavag.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/25858335005.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/xokox.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/zebik.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/76717399044.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ae2918bf---vubezefidugasasilizoledo.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/gidazotule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redmi+5+otg+supportPDF 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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 10700 bytes
SHA-256: 78c522ca724fd90583dba78aec58a85ad1abae41aed595b82a787ae556ee0b75
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 18400 bytes
SHA-256: 7b719934ab8dc328cc3df4d45f9e011fa3b556436c119f80d0daf6f397f7235f
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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