Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca43d7a617179aa3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 12:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e0ac95f1fa3667a40b8ad751a4c1f29 SHA-1: 9be9bf33a218313a332d7ae311fa27f0a136e738 SHA-256: ca43d7a617179aa3868e9867f10df3efeae59cd01e6cc9a1f0c54072bfe57a40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=thop+tv+hd+apk PDF link annotation
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/71282321987.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonogaj.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rckfl2jfhg7b02jblofqigl9i9/bujax.pdfIn PDF document text
    • https://invision.buzyhub.com/files/41523514647.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f802de7c13---83600800897.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901133029.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380fa72c880---47891031170.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/duvijupegoxisenatawefep.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/67518613954.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/31954551979.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xagumopizigif.pdfIn PDF document text
    • http://getem.pl/files/file/mipalosusi.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/jofedixinobudili.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8185b896---digegobagevilowedidelog.pdfIn PDF document text
    • http://katela.net/userData/board/file/memigos.pdfIn PDF document text
    • https://geloracinta.com/contents/files/kedagabojogekogubopa.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/23142859175.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133840f71b32---mupugezesemufiwezuxa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/3ckqfu0ktg9uets9369k5l9jhu/mepopi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132dc0aa87be---19190512674.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xozirajiweburuxisovusolo.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/71700213083.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/lizanexofosemelizikaj.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210902_010607_116.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac0d78da4---345860021.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 17912 bytes
SHA-256: b63a1e9181eeac3a1933dd4adac246ee1889f6c3736f0f8c88d7b8c454326491
font_01_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 9968 bytes
SHA-256: 2861ad9e5a310ba6e251b38dc7227ad6718e7e9b4408dd0afba34fe8060fc8c4

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