Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f890b2e94ba337…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 12:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c5c7223c1d5febd6c8e6ff4f596a1ac SHA-1: b42621a053e0dceed2b88e66c6dc9db9264a0bd2 SHA-256: e1f890b2e94ba337b459bc039cdf579f8ac2720d13eeeb68506ef717df478c0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing something, likely to download a second-stage payload. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further support this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dentish.ru/ckfinder/userfiles/files/79224902271.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362b5e2cfca---sanujiwofa.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/95413919858.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b13ae81fe---womigexumoguteba.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/40785766525.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/25585058755.pdfIn PDF document text
    • http://lse.hu/userfiles/file/95006351830.pdfIn PDF document text
    • https://fishboat.hr/files/tuwaxiserevofopuw.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/28407618457.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/82946329674.pdfIn PDF document text
    • https://togeltop.net/contents/files/45476508605.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/topotawamib.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/nupabinadokigaxowas.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/13929917736.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7422ee739d71f0dd8f3af8d7bc452aae/semanom.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/23671316375.pdfIn PDF document text
    • http://masonhn.com/d/files/derusuwumofaposabe.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/65641428905.pdfIn PDF document text
    • https://alkoplast.rs/files/85452931535.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/gopum.pdfIn PDF document text
    • http://cobmedia.hu/include/farefugedemiwinosuvuk.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/55920141946.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/kedarokedesozilutobinuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chromecast+install+appsPDF 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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 10672 bytes
SHA-256: 5eaf6b3f52fc759b0c685df2921209bf1cdfe5a6a95fef5a2649e25cc14e5e30
font_01_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 16056 bytes
SHA-256: 1eeeae3955a1e15e33d61ba73885f7c5024666babee2963f3b3eac2730b22bea

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