Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95623b5b4e13896…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 18:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d6f794e60bbb49f682ceb731270c0e7 SHA-1: 99a833c78c14d3c92c8f0dfb1dc154d16df42beb SHA-256: c95623b5b4e138961f008a24725640ebcf5d05d516619ce6e30bc4144871ebcc
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xtrafitcoaching.com/www/images/files/40272760875.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/13536665221.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/sitifew.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/75551778541.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba246a89f---titiwirujidumi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vixovikanonisanewokebo.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45170609268.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/sexikovebopoxifalivud.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/st15utichfhbspt2r6888i3moc/mogijewopenuvemuvom.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/beluziji.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/luvawazatab.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/87370938708.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd59392997---68063985902.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rikosaraf.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/54704876395.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/folunusipovosatexon.pdfIn PDF document text
    • http://dzbnf.com/upload/file///33383428141.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/78565242305.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/84069692266.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/nilujediwidexaso.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/82119019796.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/9305298438.pdfIn PDF document text
    • https://wmu24.ru/media/file/fudojulenomovitujobojod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=quiet+place+1+watch+onlinePDF 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_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 18176 bytes
SHA-256: 312daaef16aabf6a18b76e4e11e139d0fff992b7ed5fc684071d2645ee694dff
font_02_sfnt_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 10500 bytes
SHA-256: f5a2508acc6468d50b29e51187344266bae7964883d56508ae8ad5adbb64b8e1

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