Malicious PDF — malware analysis report

Static analysis result for SHA-256 4010423ed3e1a462…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 640b6a58ebd4abff61f1d26c659458b3 SHA-1: 9aa145fc58a3a9ef9f57964c85e4b8666aaf4548 SHA-256: 4010423ed3e1a4626d36480bb876f1a4773f50dcf85b8dde4a718afd94e2008e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queensflower.nl/clientfiles/fojadap.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5739edbad3---vologelobunox.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cee029bb---tavoliluvijaluvanufatom.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091abd8edde3---gipelirevarabemijedupulun.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/95934533781.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/45347181060.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/bipajulemivufiwekagegew.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/tilazinojabejox.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca949c67c9---26765996349.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/jerizizixobem.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/9765414877.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/rutuxizujifa.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lewulu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/otu00slotic3v1sf47sbl4g2j1/14492851975.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/56373477503.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4060c748---titulevur.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/puriletul.pdfIn PDF document text
    • https://beaszemin.com/files/43832529475.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/5945681027.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ba47c1bf8---nevejatefikavefana.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/fileroxed.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d146e3bada.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ead0a6119c5fb3586bf04f7c4f6119a5/76699565802.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/kudoropeliwaxatejedan.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d886c7f7e3---mitaxutubebifazozilen.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/futokifotesivofave.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/70825242289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=domain+and+range+worksheet+secondary+2+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 17416 bytes
SHA-256: 8b92da952bbe768a6dfc4ba59503180c673be9d6f8a2d0ad8192d98b2009e775
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 11184 bytes
SHA-256: 6d64238ef2fd3854ac74f84d9fa2cbbd37df0dcc565fdd848adf765508a544cc
font_02_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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