Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce3e9851d049d47…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 08:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43cb8419959e832919f4fb946801cbbc SHA-1: 0fbfb3d7aa0e3f5ac2550a348f7d6d21e5ec3e5c SHA-256: 4ce3e9851d049d47e47af39e73f0b6be89fba81f843ac2018ff5212f82a43564
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A7%D8%A8+%D8%B9%D9%84%D9%85+%D8%A7%D9%84%D9%86%D9%81%D8%B3+%D8%A7%D9%84%D8%B9%D8%A7%D9%85+pdf+%D9%85%D8%AC%D8%A7%D9%86%D8%A7 PDF link annotation
    • https://ajambary.com/userfiles/file/zanolonumos.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xokojafire.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608561d81b794---3362313834.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/38274460534.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/72029840443.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/27840467672.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/39385656506.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-31-15-20-05-57.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/13041769464.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/83207967127.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/73097893472.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c15fae1---wedajidonupunew.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/xowutakekeva.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/017f5e690041b7072ceda98e2e0873cd/53083187037.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/23281482855.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/21775568544.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1b59b791---jebuxetilo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fixopon.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/kibegufoxurap.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/28775376413.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/37819416566.pdfIn PDF document text
    • https://oversaslogistica.it/file/lagaxobebozedupuri.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xusezumavatopapiluli.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/88123403553.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/24701660927.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e51f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE51F 22936 bytes
SHA-256: 517c20d74cfc76eef5195138972c855f1701aae7ffac500886a7ca0b9d68b934
font_00_sfnt_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 19376 bytes
SHA-256: 0a6aba9e0bdd0824dd0b0058fe4b0c367c09303c9b8feaef5a32026c44306282
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 19028 bytes
SHA-256: dfda9b8b4fd7a6ad1b6d05a3c3251b2d2da503407234820946707daf30a0d1e5

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