Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a955948cdb4589…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 10:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 158782255e58c121e5d88e126f063e32 SHA-1: 30cf8797c2df0367ce7de85e67e3780e81664bce SHA-256: 48a955948cdb458953eb0c829888fdea828d23a7dec8a0bf9e730c9ff33308a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/utcl15qnianbnh77d5b22kh5oq/42479551126.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941daa9d6f3---levumolulibap.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/mivuzolifad.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/tovuninatefokaduzuvixavob.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/440e80c253145984f3d46ca5a4c0258c/gafamojabiruwagotila.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/porofotuj.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b0103898---40427277476.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/23505134850.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wibepadomatazozotisiw.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/99207074973.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e39cfc7e790---susizuduj.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/veveginorarodopijetaz.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/folokotatemokakijebezir.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/gudidimowofejupa.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f9eadd30ff9e4a2d893a9550062c7396/18308216217.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c885f16e9e5---7476742366.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/80485925509.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/9512801434.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/lebepiregido.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a5f30f8ad79cf9126d92daf63b9e61c6/55893036249.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/30716426082.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gagozasudironizujo.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/wegerikevatelalus.pdfIn PDF document text
    • https://lordoptika.hu/files/files/vewuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+monthly+expenses+spreadsheetPDF 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_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 10872 bytes
SHA-256: 1c750bbd4499bf6063c175af8ee249c34746a4f42822e9a81f094fb9d5a1c4e6
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 19484 bytes
SHA-256: c9a335bedc0aa1b6dbe353cbffd19a63263a55df4ed36e62f3f720669cadf7fa
font_02_sfnt_off0001409f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1