Malicious PDF — malware analysis report

Static analysis result for SHA-256 4902da7ca91bee04…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 00:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7da4514e4de177c02b4ff67a546294e2 SHA-1: e8dcd72cef17fcd7bbd3a7a0675d16dd63c9e247 SHA-256: 4902da7ca91bee04cf42fc23c0278225db4edb5900441718039deadb93a9532c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=free+pdf+to+ppt+converter+online+for+large+files PDF link annotation
    • http://tokyoto.pl/UserFiles/file/noxisojatikug.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/xebepefudolujofeta.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/80imav5gud5np38patrgo9spag/42445259005.pdfIn PDF document text
    • http://secretinvitation.net/images/files/29635534301.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/mulidifinugepuwigazepur.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/21191736719.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba912c978cd---99348566700.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/38969633267.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d27008a62a7---penaw.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcfb8e648---kidosavebirasatuziji.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/losomujalir.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/du3lb41vjhf9eick1lsducjv95/15863376803.pdfIn PDF document text
    • https://scalper.ir/data/files/file/96028671566.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c14be7f6---bokozomeg.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/wetamiju.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6b7bdec6c4486d57f8c6a17b690eb9bb/2478653424.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/kavefokif.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/581dek10mgcf8q4iha1fj7qd56/32945204664.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/dumabewumaragoga.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kuzuvubotafi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/49f7bf199c31c7704aa13c2e7b34d5c3/74793084958.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/roxusitivilopewemoviboju.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/75432258663.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/biridimubonerajilu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085990627006---93267325939.pdfIn PDF document text
    • http://npas.ru/pic/file/damivun.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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 10840 bytes
SHA-256: 5e936d8dc30f6421fcefdd7e32ac6a5dc6c847cefd134146c00dd9ceb7284d86
font_02_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16952 bytes
SHA-256: 2427292def99dafbbebb8a65330544e0e239e9699cd9f5ce1aceb62b6933563b

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