Malicious PDF — malware analysis report

Static analysis result for SHA-256 a403dc40f4568f11…

MALICIOUS

PDF

156.0 KB Created: 2021-05-27 17:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 386f1b7720a9cd8928571b5f99b2e5b4 SHA-1: cf2ec70326df7d8c6ee121cedb4cadd043189da4 SHA-256: a403dc40f4568f1120678bda6b4ef9c7bcb047a3fde86cb399c788fd32cf25e9
156 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to direct users to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9042a59fd---7890898940.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4fe064620eca9b45db0c40fe195d85be/35325523424.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/98858472931.pdfIn PDF document text
    • http://goref.ru/files/file/61204309735.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26c608993---455992512.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/07c7018b10b9388731d8f516e37a7282/26655391606.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a6a074e9---mipedatubobazibeleme.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8m9vnmemgivjrcuboqj55pr2s4/fiwunixinowujamidalarufeg.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/df7bce79e4f1324a864ccac4ec8ff27c/bakutosekodikotifokawiruf.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/smf76ecmv8peshcu5cfaq673kc/98319262134.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mc539jc74su1fdafr0scul78k9/fijupajudo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/23691294258.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/50559134323.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/62286109041.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/reremitenunodavevag.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lnck3kfa2cl383jhmjep632ee2/54706018212.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kadedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=permanent+record+edward+snowden+pdf+espa%25C3%25B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8FA 5348 bytes
SHA-256: 5923ea26427386735d8a15fc6708ad46e09431d03a0dbbdda1bfea55b18c8dec
font_01_sfnt_off00020ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AD0 16420 bytes
SHA-256: 12a80a7ea6a1fb63914f35d288c4c4a88236d6b423c6f452a8c11f8acf9847fa
font_02_sfnt_off00023c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C9E 16180 bytes
SHA-256: 5f3764956a3f032a41c875d4264b2744e0aecdd61c74f424ef2728f57598c8c9
font_03_sfnt_off00025195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25195 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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