Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa394c2d0b021ff0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 04:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc65068cac6201d1a9a270c28d103c37 SHA-1: 39bb687cedcaf40336414b60736bff919219d95b SHA-256: aa394c2d0b021ff07c319dbda9d5c0b59e7b8a77938493b4ee488dbb8f4aa7e7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ambulatorioveterinariosantanna.eu/userfiles/files/karotoxakajurezukaneriwid.pdf In PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/39393382872.pdfIn PDF document text
    • http://rrarental.org/upload/file/81551883229.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fuseta.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/rirefovaxunalajigewatapul.pdfIn PDF document text
    • http://mgrima.com/files/file/juxogasato.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/42269421167.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/fegejasisi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bf670f17---vupugedupelogatinugo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/84761081542.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/forizogovanovekowozedowoz.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c78bbed1c---sukunofavisawidufakuvev.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/fepofa.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d1aeaf281c50c3eba00c89f5472eef58/lakudavolej.pdfIn PDF document text
    • http://mayjack.com/upload/files/jifumedamosumofujetidiko.pdfIn PDF document text
    • http://www.celso.org/download/wasezixad.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/pimolowomisagokukasovu.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/nizigazopasidoxam.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/13953048392.pdfIn PDF document text
    • https://ms01bet.com/contents/files/59978054123.pdfIn PDF document text
    • https://hoavily.com/uploads/files/74420457976.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/rutuziju.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/susonusivexewepubav.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/1306327032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=zeal+spy+applicationPDF 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_off0000c73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73A 10344 bytes
SHA-256: 028659dd88f7a15e101af4d277154765c93d783d178a59d3763d8e5dfcaaebde
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17468 bytes
SHA-256: 6049905c84fa1baa394da6b3099f832571927bc8f7886f9938e1fa8157d1eb30
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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