Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a28f68ccd732fe9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-06 03:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4452d0bb4b8571c535973a74fff236be SHA-1: ce83989e997ac7ff60e2f83e18fa747da8b93f56 SHA-256: 6a28f68ccd732fe9c8bddbbfd649f2724a9427a9b1d7392747f53f2043fbca2f
164 Risk Score

Malware Insights

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

The file is a PDF containing a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. No scripts were extracted, but the presence of numerous links to PDF files on compromised CMS uploads points to a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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 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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608738be1de7a---28805896658.pdf In PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8efd50daeaa3708ad4d23e721e336b3f/jawafafaj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c733f5a369---zakigezawazevirele.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/26479411632.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/nudodalegovatofokas.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160741f0f4d166---jokevegadisifejakikado.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/8693992395.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f4dce22f---69012386749.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vibawajogobugikimajib.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a63dbe2a---bulafesar.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7b9a1215640a60fb8abd9f3113df1ee9/vejaxorep.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/01ea41bb28e5c409e2cbb15297921d37/38265907124.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/78576909183.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430b3c7bd9---71672522077.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0d62ff863ba95be647e3a0fa678e65cc/vojulubetitip.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160838d8dce956---xamemidokaxujapetezarav.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/tedipu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/potaziwajifirisi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/kuxinipesakakerakasasiw.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/tebamin.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fafofubanobekepunut.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab65b2b53---34196097743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=draw+me+nearer+nearer+blessed+lord+chordsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17672 bytes
SHA-256: 7b455e977149263bc5ecc7f8d71fad26955e55ca66ae271885119c3febc69b5a
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 10672 bytes
SHA-256: 92a2b22e1a36d5ec41d1d3553606a2bea7f54693153a842cb3f935c681b8a61e
font_03_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 16364 bytes
SHA-256: ca2602d65a375fbe02fa3e7c81e1256e47710d68609654fc75c88204174a9643

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