Malicious PDF — malware analysis report

Static analysis result for SHA-256 e530ee39dec0a9c8…

MALICIOUS

PDF

68.3 KB Created: 2021-06-20 11:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a0eba45ea9044efb4d6acf84f7e62e91 SHA-1: 513d9f304f30a793c67800d9dde24bceacae8d24 SHA-256: e530ee39dec0a9c8ec33e7a61091f85dcc77a86fc3372a221d2a7bc1c5e461d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, with one URL pointing to a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d841ebcaebaeb62893b2de1989a4a3cf/45374010887.pdf In PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b515b3a6c---xuvogobevoxageduwiremo.pdfIn PDF document text
    • http://sns.hu/_user/file/teloxonataguran.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/17920202119.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/2428391138.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f82140b9139e07d9f86c653dad988712/tififaterupogi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/285smuvoa4639tqfpkut19o2ft/84311376458.pdfIn PDF document text
    • https://badrivishal.com/media/repiwagilafezemopa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1e1d4c6d306823edfa3d057706e76550/vevoma.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cf58fe9a---vepafudolupi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415be2ce2b---81424360156.pdfIn PDF document text
    • https://digireg.nz/upload/73066390507.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/89ehq7amf1u173brgau3bl2cj1/71316945172.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742cb91ced8---medovenoradovabadowun.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8ibqajqv22g4phav2vsccj1b33/11650431417.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097bbeab97---niwekumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=everybody+dies+in+their+nightmares+downloadPDF 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://scripts.sil.org/OFLIn 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_off0000afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 5592 bytes
SHA-256: a955f402463255d902ab5dc32a5b5f12509bdceef9053d4a017fb54976849524
font_01_sfnt_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 10320 bytes
SHA-256: fb2e7824a4f9d4b1dcfe896ad008f2d02d4defdd8350577b17261c97849cce3a
font_02_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 18888 bytes
SHA-256: b63fad6dbd44a2bfe80848df71b1d905589ec24593983b0625667df62d687f17