Malicious PDF — malware analysis report

Static analysis result for SHA-256 752ac85c482a39bc…

MALICIOUS

PDF

84.0 KB Created: 2021-08-27 02:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b110d22e99376f06e7a833a2a4e20470 SHA-1: 4c563ccc766898d4166a03bd3aed9d710fad916d SHA-256: 752ac85c482a39bc3ec0fbadc3831d984029eb60adf42a4332616b226669433c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and the 'link farm' detection rules strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=adjacent+angles+math+definition PDF link annotation
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cpu3r5tp7lma0g3gg2840l0296/komudinawuto.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/vitew.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2db9342d7e9037739a368e5f15dd3a08/95687586630.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/tigivanapilufivifuxid.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610aad66d5868---22860470815.pdfIn PDF document text
    • https://asiajitu.com/contents//files/28038231187.pdfIn PDF document text
    • http://arablift.net/userfiles/file/28776721706.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mezebinovawalanuti.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/517469721.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193074998e3---71079029406.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054d6b82fd4---9350138394.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/79248946197.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/35822735581.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210630041238.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wezazofagu.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210817122034.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/89788313419.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/91202199498.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/ninanijabul.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/47490857799.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/73952210894.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098612696263---moxujamiruxodav.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/gogowowunukakizowufodeje.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
font_00_sfnt_off0000cc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 16740 bytes
SHA-256: ae2be6912846c4d493a7e236cb9cd825871e5488fac14907a5ba50b477b2d588
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10936 bytes
SHA-256: d3ff31e019b72bc4493b64972265f731f38c3195d24dd995377fcbf55e7937cf
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 17472 bytes
SHA-256: 2c3ed8e1c64441d46a55ee2dc3561c0b159b5a71a1e7b374835cb0078ce493fd

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