Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac1e78e1e39f09…

MALICIOUS

PDF

101.0 KB Created: 2021-08-17 14:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f293d924edd56269dd15ee6d9d21ce08 SHA-1: af67ef404944b27f5f7c6801cf8390d01913de66 SHA-256: a4ac1e78e1e39f090b3b5f850f263da309e9bfbf2684adc01b94d37a4ae062d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cakenflowersonline.com/userfiles/file/84905248441.pdf In PDF document text
    • https://lotte-ppta.com/beta/assets/file/nokonagezujasogowabenava.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g345fvraole4rvg3lk3av3kgkh/dupubadaveruligavimid.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60f8e63521eb7.pdfIn PDF document text
    • http://congluc.com/upload/files/29948826483.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a28cf3e3c6c---86524416950.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2f7c57e6cd0cb750195d466f2f8ce128/vupowumebelizakuj.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/62308291940.pdfIn PDF document text
    • http://canvangdientu.com/images/file/pawojitadupaxaxudo.pdfIn PDF document text
    • http://allycatering.com/userfiles/82289341621.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/gupigub.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nagurujulekuzelaxuzede.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8dfc95717---19125788247.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a466bc6b7837f33dbfbd3e0fcf979a10/82641000263.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/cf347862d9af59f923b71509b6ae9c7a/mezeme.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t1r7ctpjue26iigei9tlcfaadt/72932984408.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/52108341712.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/71523847122.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kojezedagaxotafizukijo.pdfIn PDF document text
    • http://foxadv.net/file/67117902170.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839be95572f---padopabipanekejolam.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/223359dae7baef88598f77fc17b97b71/bomelabupavogexijorizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+gracious+quran+ahmad+zaki+hammad+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_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE9 18900 bytes
SHA-256: 421e1c2606392084aa885cd510df959e0e379d699b83e7e17fc43b40246d7047
font_02_sfnt_off00016be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE7 11284 bytes
SHA-256: 635546dfa780914aa4062edfa32ae61e44f822ec20346d6db9563cb0e6ccb07a

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