Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c65864d2491e4f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 02:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 090d6811834ba9a6bb279999a34686b1 SHA-1: 28606d034e214405e00d10ab527cfb801a23d92f SHA-256: 46c65864d2491e4f9794bac6f7ff6a6b659fa1fc9354eaf4b18d638a996d68c5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crownprolaw.cn/userfiles/Proj_Name/files/pukafut.pdf In PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/didavo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cc91f2f4---86527941863.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/vatovuboni.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/galumeguwevogi.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/1877342890.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/27397130129.pdfIn PDF document text
    • http://vpsystem.com/files/fck/9408706404.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d568700e---sowiwavojujisujisukewowur.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k8mrnu04u8cnqonb91gt7o1pbq/xojosegibijujegaxux.pdfIn PDF document text
    • https://primer-spb.ru/files/files/vexixagesazonorolesod.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/magojumaturova.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/13808927849.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/guvuvelilu.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/jadelogijubimenod.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/70533566072.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/kilezimibozanig.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/webusifopemilobelosupilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=x+browser+apk+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 18184 bytes
SHA-256: 48bc1b23886086823523ac1b965e5b9723755a5774b192dc2fdc061bb0f016fa
font_01_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10520 bytes
SHA-256: 6e4db17b9ea9ac0166631aab1fccf23980fa8535b9179c410bf0db142ca3ca3f
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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