Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d775e3dafabcc2…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 00:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f93313e4d70044b8974c6c9d00ed5328 SHA-1: ee4ec71c503cacd2d9aae4553bc63aaac3dba4fb SHA-256: a8d775e3dafabcc2b6c1f1c8de8b8326c6a3283c977a83514fea5a57bb58fa64
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits multiple high-severity heuristics indicating malicious intent, including ML classification and ClamAV detection. The presence of a 'Clipboard command execution lure' heuristic suggests the document instructs users to copy and paste content into a shell, a common tactic for downloading and executing further malicious payloads. The document also contains numerous links to external resources, some hosted on compromised CMS uploads and disposable domains, which are likely used to host or distribute the secondary stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://imosa.asia/uploads/files/202109130521432989.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319247195f9---xitigenepuvebev.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/44293296412.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/bawodopafifurugiv.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/43418259166.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/wegiwewevivukifaboxetoj.pdfIn PDF document text
    • http://sakra.sk/storage/file/87087733912.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/fibusatimudoxa.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/rufelavawubejevovejiva.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/lajobajamuxeg.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/72153991774.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/715da72c82133733efa731679235034c/nelotisaxi.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/bisoxazizusizilun.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/12189068119.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/refiduzesakegatu.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/56611789890.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/51892455094.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/nudeperovudilinupabuni.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sunuzusakemaf.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/6207670005.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/vapevis.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138980fc881a---92905700940.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390df68af0c---fadowagevifi.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/16996951368.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/68634683618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clear+chrome+history+androidPDF 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_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 18212 bytes
SHA-256: 31f5f7abbfe8839932da100e013006538507a3d5f3d3b2f226a953c8bf5fa81a
font_01_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 10780 bytes
SHA-256: 4995ae94272ee2fa9bdf8e4cb02d369b4ff6c89cc398e9b50fd72357092f0740

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