Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd3ebe5f03d2f51…

MALICIOUS

PDF

98.1 KB Created: 2021-09-02 17:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa78835cd7db8192399954f44a1dd93b SHA-1: 2e9cc6b93a41bac1fb4714541be43f912bafdae2 SHA-256: 4cd3ebe5f03d2f5191789f7084aedf75821203bcb2f54f0b5c3cca612b4a3ccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified 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, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=divergente+4+pdf PDF link annotation
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/531c610610a3958841c9b1b3879e6d9f/kajoboxoxulajudal.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5fcf6a96c---97998592141.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/44901730897.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/840d2c718bb878ebeae4feb0f68c2691/77230166420.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/96840052691.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6719cf23eb---43453657367.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/36601325557.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/lofixapi.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/revuk.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/04c88ffec0028f29ca39919dd108fddf/rijekavosuzuvuwibul.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14dbb74ed7---35275588857.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/10002361518.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ahao3oii5fb2gu5s8n4bovean4/83895161050.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/ropogakevipu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbccb928eb---75062918621.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891050d7faf---vejebuviwavosapuwosa.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3c146e1f8caca5cae1f9757c03cb94a0/basug.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/52754545897.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/84822701225.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/bolavuvowalalilos.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b52a15ac9dc50b03f7ee2d6cb9c6a8f2/nufonewelapiwove.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d6380f4a42443ab2ef12ae5a94bef0e8/55050418006.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_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 19632 bytes
SHA-256: bd5526f34621743a17e430449fc254f691743635dfe64e5c5f9d095f962e54cd
font_01_sfnt_off00014bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDF 10324 bytes
SHA-256: 3d1ea038caf4fffb769c1300491a91b99d1118565392d04792fc49e3af61c4a6
font_02_sfnt_off0001631c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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