Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66c54bbbdd2052a…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 14:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9bf354cd70e0ab67fd92005eb853fb7c SHA-1: 85c9981c1d62cb2e2a5007ddb03307b1b58ece75 SHA-256: a66c54bbbdd2052aa0e2cba4688685e961851643a1eb5f72290434a5915f7bc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a link farm designed to obscure the final destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

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 http://xn--d1achljw0b.xn--p1ai/content/upload/fogerozugoxugizolaze.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c4a31c5b253fa78fa86d735234460810/zikuzobokokudezoduriw.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuwavixonegon.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/634963d744b54ee4b6f8014f9ea9cc50/vijofokopefev.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/35138653859.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/fimutafibibibami.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db8399143a1---wigiwate.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zisupitugipopibakob.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/fozofuki.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cff005937---tezepisigogom.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0e0d94faf44d91bff3ad566cba82e2a7/46123937774.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sobeponomazivito.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/42332614760.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nanapafanuworuro.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/61055174821.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba8a0c942---nubalosu.pdfIn PDF document text
    • https://hirurgija.me//files/67890306478.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d28e735d---89141780078.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070293a01fee---xogipufalevanubevu.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/26068014549.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/josabilefut.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/np5li18eetcp5ebtg2j153mn44/55377846319.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/631cebabcec3a9d34f7e0d3b5222b04f/dagewenit.pdfIn PDF document text
    • http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/56486352181.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/20788791795.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bd136057bc2f89cba7fe9044b36d3d39/fusipuwijenepeved.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f04a7fc91---74523647145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=no+mercy+meaningPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012ddc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DDC 18788 bytes
SHA-256: 564a8a0914c1890affd24ac739a71623bb7115a9774d7ed16de8fcba77f4c4c2
font_00_sfnt_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 21984 bytes
SHA-256: aad20b4a1eb18a8108ccfe732a5a5a307083b97b442b7cf75ce084b5b87891ee
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 10352 bytes
SHA-256: a1fc3f83a61a7b971ec70a919843738672577bb555035a9ce86f08dc54f0629a
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off00014d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1