Malicious PDF — malware analysis report

Static analysis result for SHA-256 840e05a168d9b806…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 32b65788f4da09eb0bbe2ecbe6e282ea SHA-1: bbe3801c196ace5f23adb7a8f6ab93b503d18e52 SHA-256: 840e05a168d9b8067bb2bd331e29a639f3dc6daaa0f6d1eb5ea25e8070a03cfd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, suggesting it is part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution, disguised as a download link for a 'pokemon go hack'. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdf In PDF document text
    • http://noithattamphuong.com/upload/files/mapisawitiwabijikifuxag.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/rovuvakop.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/xozuviweravolovibosur.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/gorivapaduneru.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/tevosokaroja.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/wumunatakininifokogokamek.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/pebaxafivogeru.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/91208936095.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mutevativ.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/xizatadepiwabez.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/pukaragixuwopetiwisosijo.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/14829364087.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/fejozipedoliwedeniwoxufek.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/safojifobujutodub.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/katuxilejenabatedowuwa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/uvsvfbohj6n71f9e4a2fq6aq1j/93029266500.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vukogisazu.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/79144858787.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/rifuzuxosen.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fb7f3840573af0caba7b4911b56f95be/sigajusigabax.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/lurepirefijiz.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec26df85c---genasuv.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/9385659277.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nivusaxiboxavumokel.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/64513910963.pdfIn PDF document text
    • https://petikdaun.com/contents/files/10971516579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+go+hack+ios+free+downloadPDF 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_off0000b6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F2 11004 bytes
SHA-256: 164583ae14980dd1a509c1e051c8aa0fde48f30480b669f27ff0198af68b5cc4
font_01_sfnt_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 16468 bytes
SHA-256: 07775c1a5f8bfa0569dcda78d9e741c12c6f66ec2b2d5793d46a5db800a29c7f
font_02_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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