Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebe0550e112f9b9…

MALICIOUS

PDF

93.9 KB Created: 2021-07-26 15:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d578a32dab48d0e6f58d4615617673c7 SHA-1: 05fbf434402aa3fbe94546359e5ff706fdb28a63 SHA-256: 7ebe0550e112f9b90d2e2cbde940d43df8202c0f21fb3523b3b4dd9440bdfd74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the link farm nature. The embedded URLs and the overall structure suggest an attempt to direct users to external, possibly compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e607038849---54189425760.pdf In PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/75465398069.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/nopesajuzul.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/57446353185.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pnnbh824ou8r9bujjnkoda31r6/pilapuw.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/764108c86f0ca9a64199dc6abd9f3d06/dimafikolenefogikagaz.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/50826154733.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/wadizorimekasodenepapize.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c362d044195f8a91b8597bb858323ffa/12674159025.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/45524937535.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/bepararebuji.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/vozabedesata.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f09ffd111ffcf2b1228d3e1349875e73/34776247547.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c93747c3c7d---46712787531.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/sabik.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160927c8e11e82---puzizopavetalevo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55194b2bf---35395444870.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/d3i4iijq9ffmehtllg1tbd6v4l/jajaxupubebalifukijozediz.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/53233422212.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/836bf155f0c50ce689c21bff08389d0a/23072328863.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a01885ff7cbaf72ed63a1612a7aae19c/19852529914.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ip7f7ia1l8g2idslrjrlutlhg3/xidaz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b87976480---zoladusigubugufijoki.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/rikubuniwepikazilalusaxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+free+movies+no+sign+upPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/785b503bbeea5035ee3f50b13f0d609a/tapifuv.pdfIn PDF document text
    • 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_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 10712 bytes
SHA-256: 8d613acfa2306f452d353b7d2bf796502acdda951b4b2e3c8ecc626d171a402c
font_02_sfnt_off00013cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 16560 bytes
SHA-256: b10f613d6b146dd1515c097a8f565ac723a39548346640cf52d0121850e1826a

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