Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0d6fd78cc63c33…

MALICIOUS

PDF

77.2 KB Created: 2021-07-01 22:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c0daad33aa9f6c402d8fb105d42f1adf SHA-1: e8b2eceff0085426e3d02ad405b75ccc837c1d86 SHA-256: fa0d6fd78cc63c33e70e67b0a13b11c85876919b225c79afac221905c7bc568c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://dunakanyarfesto.hu/ckfinder/userfiles/files/62257805659.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a46599ce4---jafuwuboveserobilajopu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xosujo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59365991213.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa31a142b66fcdd269b103eb8941fd7a/wimifudowodoj.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/faa5e14a9a8af55c822bbbb727d825f8/27916205298.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9b6af81b233a69fe5f68544b9f65b3be/zisasofifavasosamufabe.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db9e399cf---vunigaminovenub.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744caea3675---41763706420.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/37383921344.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79793277640.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/3918505475.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3disjrgkh8jgq0siifbht6ic1t/mulipunoxuzugapimuk.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2ffc48b895b36042a7b809bc67b6abc4/wexemefiwoputigaxikev.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210630140601273795.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7oavjuploev3pcsetg23igt62a/wafer.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d245ddae0b969748f969e06c6ce89251/japuz.pdfIn PDF document text
    • http://veivel.com/userfiles/file/zojezovojepisixatusakefi.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tirogafazulada.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/caan68ollc7lmn0n6o4pnf4t3v/58406411719.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b230d196961de4c61738797f35992271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=aesthetica+of+a+rogue+hero+eng+subPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 16368 bytes
SHA-256: 8ac88dbdf622dc6483f2587e5069604a9856d58750e291869f4b5d49748d59c9
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16460 bytes
SHA-256: f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10788 bytes
SHA-256: 18cd235705e28be9461393d0e1d3036e9e813a03c79646a1880e92731582922d
font_03_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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