Malicious PDF — malware analysis report

Static analysis result for SHA-256 5007c73812955338…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 08:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bf7ccc5e544fd3d2bb39e8cec6e4ccc SHA-1: 45e4a6df28c8ce88305dc6aaa4598f099b1a7968 SHA-256: 5007c73812955338f0a41839d7c7bfc46123d70c15d9fc70105ae50957a97346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=science+1st+lesson PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5f7b9e07344d228826aefc793638489f/ditepawapipumilowilut.pdfIn PDF document text
    • http://foodchemsino.com/d/files/8668021928.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/16071659928.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/0ppag56jcss1d2ocb3jkhh2k50/berug.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6d2d5390ceffcec9d00352acb3cea01c/siwudusupamosesozivavuje.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/sibuworileli.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df0a7d5edf---99335566335.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210819115930368721wgjebz.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/sifojun.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9e53dd4cc---37678376829.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece853f034---54958875864.pdfIn PDF document text
    • http://erex.hu/upload/file/zarenudujolajozifebakagiv.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/bekagofovipin.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05adc3fd45---10171063614.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/lumujidosupo.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/xitake.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jixezobufezofizebelus.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kikojulejaxebuli.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/95331978017.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/wadotisinij.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/rupolopozurokul.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/tovudoti.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8c653425f---77719816178.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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 16808 bytes
SHA-256: 683ae44a9ad241f21462c0ab94920e4cb133140e8474907770f3cbd5f83a8028
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10088 bytes
SHA-256: 57045bcc28c88dabd1cf187e9f39e85855a52cc4baeb17bb69691d8f28ba5d08
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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