Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7445c9f18541e32…

MALICIOUS

PDF

82.8 KB Created: 2021-06-17 14:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a815846739b36608ecd5ae1958846adb SHA-1: 48c0d5d17e3759103a23a14607e53396ef114447 SHA-256: e7445c9f18541e32621b0fccd32cacc1a1cf7836551102350a0082884f7fc531
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The embedded URLs and the structure suggest a phishing or malware distribution campaign, likely using a link farm to obscure the final malicious destination.

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://inwebjor.ru/uplcv?utm_term=durkheim%2527s+concept+of+anomie PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a407a940---34072601586.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5582bd4204---20909485506.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b02f1d82945dab3e43d8d3be4b3900d1/99809791080.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/65299843745.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1e3de6bb91bdd7a8de24b01aa467322b/83560269404.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf12d7395---55201602038.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/9679847676.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/72859465419.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160722bd8a7179---vezunudawazukabigufaxobum.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/69239432202.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/15459546414.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d8a641871ab1f1a2026f52eceb4f5e85/jufejineduvigat.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/enraljbkobq9b3dgq7rr4ui4on/5864206666.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/59527286665.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/55877004967.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/26qh3pg1jgr4c4770lqbt1qs13/josopevabepezapeboxere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 5320 bytes
SHA-256: c936e46c5bd13227a8e5f959f813cf5aae96d4c6eb752aa78ed0226cdb70a07a
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10844 bytes
SHA-256: 9f335696829bb967e5863944dda268333e521740b27486d4e87277b84531cfd7