Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bf515c28d6e821…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 07:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0f5f0d1b50b7d55b361a46216932a55 SHA-1: deefd09a7f373f6d61ac55757a7d3512d24fe00b SHA-256: 06bf515c28d6e821255b9393631d9f3c01e818e6f1aa6d2b358f9740da9ab26c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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=math+app+that+shows+work+and+answers PDF link annotation
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c149db7154e---wusokuraxid.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/23432534448.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d686a95b0---91249961552.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20c6c0e0c---goritisibu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3803920001---bomalusebebewo.pdfIn PDF document text
    • http://cga82.com/admin/File/luroxiputuxolemexufuwojo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ff3b1d255bef6d5acea0ab0dceac35b8/26015911455.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c220a8bd863---lasolamafefogumorilaxidi.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/70168307503.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa05d291d5---zagok.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7e8f2900---zazixesez.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c380898e4e---50763406738.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb8e1dd6a---lemogovenosovofezisunasu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d285mkc45a9elrmm0kmij2qpi2/pazifazawamiguseni.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e01c3729e---wigipipifogapixadifukuza.pdfIn PDF document text
    • http://change4best.ru/upload/file/noliredijusade.pdfIn PDF document text
    • https://tavio.ru/files/file/35407462061.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/52fc32ced6914737106368164ad4c12b/47753512395.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ana8o5a57tnegg398tg970cckk/90424779556.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/5638432862.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/64351689432.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeqijk11f3robojss3qtk8lr25/fosibebezukifafilagu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a54ab088da2526de347b44975d4e4c6e/87025580797.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6caaae64---74601355424.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5rosrcjite8tu2dpg99shjhn6a/velinufolez.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7a3bb077---majul.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8b51d11b7---topesuw.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dbd3962a9f18b1b3ca4ea23dafbdb3b1/23119275337.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_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 17604 bytes
SHA-256: 10a27e7181635954b8e5696fdc2e8b84677fffc7bae15fba1864a1eb2b4a6fde
font_01_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 10520 bytes
SHA-256: d1eec4ffe65ee286fe0e8872ba7a37bc8985819ccd4e83d6bcc6bcad7433a35b
font_02_sfnt_off0001498f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1