Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaacb4c45c50668…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 03:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76dfd3aca5da9e6fb396518f869705da SHA-1: 89c674f8e50ce759a6beffee92ed55e2f5bff5cd SHA-256: efaacb4c45c506689ab4274c81edb922a16e8d8b91d054716bf1b6af128e14c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://philabc.ru/uplcv?utm_term=our+family+wizard+app+for+android PDF link annotation
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/824466f89b0e232e59a33d931d1ffdd2/nodagix.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/runusoxivuxafexipusixe.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tujijafebibivesuwu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/67729144872.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210921132112.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/juvakerod.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/lumafigajugetosuzizuvonow.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/45412795063.pdfIn PDF document text
    • http://rideco.hu/upload/file/rinevu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/54039525476.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/58577421086.pdfIn PDF document text
    • https://proia.bg/userfiles/file/98787406829.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nojawojoz.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/4570789698.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e209b04593---47785014678.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/98182752189.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/deromoruxilolu.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/30979449289.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/14657964048.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/23469779365.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b725417c6---rufuvizejebikamegexorote.pdfIn PDF document text
    • https://izometal.net/mm/file/guzemoxidowaxoreberos.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/aa5aa9400595b536c8f9de706c7bbb45.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/90819965394.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6139e318b2097.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/3572505820.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_off0000b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 15156 bytes
SHA-256: 04c2f5f6f90614246b766751a7ae1b86eead54c20989f54cb1fd35bb141a726d
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10644 bytes
SHA-256: 570b0ceee7d2d6506c1e7daf94de4a1247764360549b2ef27afdf3d7a2b7a5ff
font_02_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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