Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd38deee0be0773d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 04:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e93691b3613a11866f762d9d402607f3 SHA-1: 52068faa855d662356a371fdcc47027ecc44e396 SHA-256: bd38deee0be0773dac23265041ce3602a945c28268a2086f1ab26116324fba0c
216 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised or disposable domains, suggesting a link farm or distribution point for malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to evade gateway scanning. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dptech.vn/uploads/files/fifuzopavomibexim.pdf In PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/91064067365.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/37168921038.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/sadipagunap.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kiwebiz.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/loxus.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/pexinifanuzepawu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2723d27c4f42215bfd274d1dd8cea203/22404828372.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/badudesa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0ffs1c26s9mbfftmrfhao08klj/lawujifipiberutiwe.pdfIn PDF document text
    • https://sitarasign.ir/data/file/82136696812.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/newerowasir.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/gidaxilibinebagekabaguxus.pdfIn PDF document text
    • https://fond.ru/userfiles/file/dikawifujedel.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/bejetisitote.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zanijeka.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/71955006847.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d067f05de---lorete.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zefuwesowadifapepigugejok.pdfIn PDF document text
    • http://semanbio.com/upload/files/38663230497.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/biseborup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138373918ad9---6314032682.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/92648199591.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090617254932.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/vemodofid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+a+password+on+your+phonePDF 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 17800 bytes
SHA-256: 3dbbe4a3bc838fcc552be4771cbc7b3be2baa0b512a7bb7b9d129aac772ba8c9
font_02_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 10644 bytes
SHA-256: d84ac63725c06a6f668386e27caa8adb3d07dc18b48121b3ee90713ad0ef06f8

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