Malicious PDF — malware analysis report

Static analysis result for SHA-256 545b0fb63b720b67…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b4384dad749c9a96b268dc2d62b2afd SHA-1: e688e3fa089a79f7a0627095bca948f98615ec28 SHA-256: 545b0fb63b720b671c7ad5e101ec478b0c8764ca447dea41ab630d45a27269b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+to+get+pokeballs+for+free+in+pokemon+go PDF link annotation
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/borugiten.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xanoletegaxuwurasexo.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fedevudadogoxiwufuxabuli.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/45150e7aa3e9b939730270fc649f36bb/tofilerebizabi.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/49822634418.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zadorujotixenan.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zifovifezimadukapa.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/kaninupot.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a805c18ab---51870820171.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/bokikutareludalovisuxade.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/romokizaxavoxofabif.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/xesijumiv.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/62323320945.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///silapiramimidavuzeneji.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/72c3f8b603eb37d1dcef3173d774b205/zoturuxunoga.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613969cccb3b5---nefuzojukisajozawajelogup.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/taxoxu.pdfIn PDF document text
    • https://securitydm.net/slicice/file/xunirusimojodax.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/74989301493.pdfIn PDF document text
    • http://vo23.ru/upload/file/tadafigosole.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/medajujigutu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/82607690954.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/64714780342.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/45860838058.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 11008 bytes
SHA-256: 76e8bc6d17a606e50ca96a8de226fd8049d272745d6d7ede4b5b74fb220c4c1a
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 18356 bytes
SHA-256: a2e72836058318cadfec377c598b04a82a2c18082ae1c22fcbe5a2a398f3d52d
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1