Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4541cb8e7caacf4…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 09:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f1572e81edee5e0eb866891625813f30 SHA-1: 55b410c4a4c5d56cdb64fcb06ebdb50ff1b12226 SHA-256: b4541cb8e7caacf440bd476532a4b02c5479c8a0e63047baf977d5327dcb7616
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • 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://www.padanguparduotuve.lt/ckfinder/userfiles/files/mozojiruve.pdf In PDF document text
    • https://bushregenerators.com/userfiles/files/vusuxibu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/maipsmoa3j8ir5k266m8bias25/21177248428.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/2191615338.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/80157027615.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/18373588095.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bunizedadibegoruxiwo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4fecdd7e73a112e68f98387d03fa0b6/20511492239.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04ae116a8---jipagemotudavitowivuzevag.pdfIn PDF document text
    • http://fitviewer.biz/files/file/mutavakibap.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/bedasimogenum.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a719a34b---xubusomuxaxub.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/75122502849.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/22983979818.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/14692319252.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fexogodiwuwubuwajuxejibir.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea2f91de7---zukatuporofaz.pdfIn PDF document text
    • http://seritour.com/rsm/files/81636319025.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/jedokuziri.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/gokiwuvexulum.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/41197682429.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/821841461.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///52023895845.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/39244698909.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/verododonovedozupagamodid.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/posefunuvusawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+is+my+cutepdf+writer+not+workingPDF 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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 17920 bytes
SHA-256: 6ed439c47cfa6698b19896af933bef13cf878b540d943d85748ed0847bcc32a2
font_02_sfnt_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 11244 bytes
SHA-256: 9ba029ce68ae4373de6f586b2b7bc268fdf2864f0bf9742b6598f19c42bc339e

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