Malicious PDF — malware analysis report

Static analysis result for SHA-256 e435015c4929127c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 16:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc014de66a22caa698f0483e57dcecf4 SHA-1: c488fb6d4b494a28e254c2e92c467dadb225c706 SHA-256: e435015c4929127cbf2344ea036d6fae591ff8e0837d23e5f1b94f9b7c143c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=update+sims+freeplay+mod PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce10dd445c---busexeveniwuketasisizo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/138224435613512db82adc.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/21905686755.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/48288882512.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/74014446128.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2e6kdl2566uhgd6b2ul7nefgdu/febuf.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc530e590---36243450087.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/bifazosotodozo.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/kusafumejadivili.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/6970724017.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/31462181566.pdfIn PDF document text
    • https://stopserv.ru/files/file/69751927023.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/31680933775.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307ba784a4f---76867652349.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/sineferizu.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/lexeliwokenexuf.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/fonukujatekafetav.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/ferudoru.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/kagelenek.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/94108546452.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tarivawiva.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/63120793156.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_off0000adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 10676 bytes
SHA-256: ce88db0c8c1aad511b5cb6b3e752be3db95e21f2eea1e938cea1e26d64009f91
font_02_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 15824 bytes
SHA-256: 4bb4ff9c25e93b8ab626eaf909f1ec4332b3628dbf76a7e2f95816a359b3f264