Malicious PDF — malware analysis report

Static analysis result for SHA-256 4817bc0b05c4134a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 18:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76e81a7171186df566c143df563c6a79 SHA-1: dff920c74498668666debe44e7037a642a4fd383 SHA-256: 4817bc0b05c4134a943f7319bc5e02cb08e35db8a25a2d7dd13d162706098168
192 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristics indicate it impersonates a cloud document and includes a download button lure, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=converter+pdf+word+android PDF link annotation
    • http://gesundheit-im-blog.de/userfiles/file/38082307914.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/lefatubijimu.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/josib.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/vexazogufe.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/zajere.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d26d28e98---53905285696.pdfIn PDF document text
    • http://ipllaser.in/uploads/fusixabozupotisutadeju.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/dulafovo.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/62372042622.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/11553293042.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090708504473499.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/77385441228.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/vikepujinurujoxopukefaw.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/84393419154.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/31022187846.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/tadufusawa.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/manubixinitudeg.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/87040518655.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/93565402417.pdfIn PDF document text
    • http://asvpp.fr/pdf/sogazojogolojob.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/99834548431.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/41962483562.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f697c2dcdb---41407353898.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1516fa91---5100664987.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/54993067102.pdfIn PDF document text
    • 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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 17344 bytes
SHA-256: e589bfc3ceb6315742463517f4ba826668279e3b5081c589a26e4d8122f6c90c
font_02_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 10460 bytes
SHA-256: e267e750f3eb80b55fb5735bbc60f420d6f6ab47d0cbb33b759ddf60e5cd03f8

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