Malicious PDF — malware analysis report

Static analysis result for SHA-256 184b387a825d7f44…

MALICIOUS

PDF

97.2 KB Created: 2021-09-13 09:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eba3b0155be8530607ea2fee88b34f17 SHA-1: 69b0ba6bc0660c7a5881bdda632b936b06ca70ea SHA-256: 184b387a825d7f4466ee970c253dfda576a59663373e0c847f9d9468fd2a05a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=install+angry+birds+epic PDF link annotation
    • https://radekslodkiewicz.pl/files/file/85607711516.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/rubaxobixevulujebokogov.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7f81155e---jetezutemowuzef.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/12285167579.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xelixodulofodakuvav.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/80228421452.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xudamibilemuni.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7241ae1aa1a455cd3489a73caf912e15/kugapagofijonokesiratanoj.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rewumatinuzukit.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topuzeses.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130edb8703ef---73235310623.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uj2d4f75nrlmssqrac2on39rvt/guzizemabegek.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b1caa7dd52544f7205de5f9fcc654a9a/80364244279.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/88930332082.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/39606990607.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161386a778d883---89111012190.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908180719370786eou6etur1jvy.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6407670f---betuzatigexivam.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/tozaxirefavupabi.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/74690658449.pdfIn PDF document text
    • https://rintrans.com/files/mowirinugaxive.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/jazokoro.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_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10772 bytes
SHA-256: 0521009fd91d9c9fd6d1c62e35f3e29d2f48e060210c7eea35c8b92dbd99fed5
font_01_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 18576 bytes
SHA-256: 2abd560652f2d9ef03a25521ec03f5758ea5ab8f1f230d696de74dad55169ca5