Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f3be9b72d8128…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 17:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 558551c1b613a8d8186c98c13d1edd6b SHA-1: 72a9a3caf638023f7c8db3de9ff15c0d635a6b15 SHA-256: bf9f3be9b72d81286f6d0a73387c7af0870fc198e12fac3ee42e645e9b89e72c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a link farm or phishing lure. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document may attempt to trick users into revealing sensitive information like private keys or backup codes. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee79b0a5afd---jefixelonasaputobaj.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/bajilowifudirizajodonur.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/80429981561.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16100f23f4f2c5---63404409240.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7101faef8e---701610183.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/omfsp6v3g94s0m9vubbp3t2igr/15891858279.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778e48f7e9---38051894529.pdfIn PDF document text
    • http://atomleasing.ru/media/File/58407873985.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e457e542---63492408391.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/napokoxaburewukozixer.pdfIn PDF document text
    • http://baoveantam.org/upload/files/40379845232.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a59878873---71373344822.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/47001094375.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ledolakurimixozusetikaw.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16129f0baec94e---3014177700.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/2080430936.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m8b82shcof0cjmdvocf3196653/guxojanebijesekodozoda.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081203607803---wupufaxuxazamojulikarulot.pdfIn PDF document text
    • http://kco.su/userfiles/file/35745147658.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jugubezi.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/80867008802.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/47459609021.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5b6d29b86eb6976e0cb513e705bf9b55/nizapuwoxuxukon.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/89798358579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=parity+bit+in+digital+electronics+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 11048 bytes
SHA-256: d7a7d5f08ebecae159a4691a9b80f9e3f982f148b332628bc48b7e5603249f0f
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 17780 bytes
SHA-256: 6074989004dc9cb4e036c47884bfa46b0d638bc6eb44eaecd2abbcdf4b73d702

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