Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dbd5e58fa3a603…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 18:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 274046af2b908328ad05c914795d1337 SHA-1: d6bac20b849c108f37d2ddf66e64d3ac58fa6817 SHA-256: f6dbd5e58fa3a603121bfe3b805462f96cdcb8c63400a56407fa3e637a4436c0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains multiple links to other PDF files hosted on compromised websites, suggesting a link farm or redirection mechanism. The presence of a 'Password-protected archive handoff' heuristic and a 'Callback phishing phone lure' heuristic indicates a social engineering attempt to trick the user into downloading a password-protected file or calling a fraudulent number. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51c549ab---7007397993.pdf In PDF document text
    • http://lollanaclinic.com/image/upload/File/jadegis.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/pezap.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109012215576787.pdfIn PDF document text
    • http://medica-brno.com/files/mudizufinonu.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/39990569836.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/33117644552.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/57009926730.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613613ce9f267---kikafore.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210913141246.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/9538387289.pdfIn PDF document text
    • http://carszana.com/image/upload/File/wurewezizimekibizowigo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7aad0749be8ed15da2c604b4d83d2aa5/30211457863.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/piponi.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/buduterudujalowutadiwuzo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/97130384691.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/73929152176.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/67062463933.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/lobiwotezusurewe.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/25355546652.pdfIn PDF document text
    • https://norservis.com/files/files/10222255136.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/loliworuninanunireviz.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/biruxivifixu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/90345707195.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/36641016677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=outlook+mail+apkPDF 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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10128 bytes
SHA-256: a01b9f748877ead5180d121b5d3aa5d2104279f817f45a4177d1fac1d5e6b2f6
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 19480 bytes
SHA-256: 4e3947af9d9fc165b95ceb2a25ce6a756731b92e6aa16a768ae497409beffa32
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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