Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bef3048bf2528a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 11:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b30ab37d282fd5624d5614477a5708d SHA-1: 3cabb74580206dfef1e64a30b641e0d50c881c71 SHA-256: 54bef3048bf2528adb0d9d3fa63232cc6ef88b43217e6b70b2feaaeb20a2236a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains an embedded JavaScript stream and a significant number of external URIs. Several heuristics indicate that this PDF is a link farm, with many links pointing to distinct hosts, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://urparitet.ru/admin/ckfinder/userfiles/files/71965197080.pdf In PDF document text
    • http://demkapi.com/resimler/files/94416846038.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/jifuliditi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-9/20210909044914272718.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fb8ba2661a83d337a758c79c0d0184e0/75866781054.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/23414174443.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/vowajusizoxi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/rorogarabuvuni.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/gejafiraw.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/tipoxajigezejos.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/deviseriwafoganimeniziru.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/42788952176.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426384be45f---91159939759.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/9876082225.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/fifegejifavamujizijuv.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/30765451611.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/gavarodulabiloforu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/85912249701.pdfIn PDF document text
    • https://ijp2.com/contents/files/58085254279.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/danobijekifivofewo.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/bosiwara.pdfIn PDF document text
    • https://soechi.net/userfiles/file/53516011153.pdfIn PDF document text
    • http://hiniceshine.com/upload/lisix.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/59e06d1013ecca3ecc5aa764fe9f12d1/xamerefasatufaxonudet.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/patusago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310857e6801---1588455193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=angry+birds+star+wars+hd+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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10784 bytes
SHA-256: 0c3f41c1ca2cc50f3c7da15e748573c576885fdf83b0f4fe9eb481445102252c
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 18020 bytes
SHA-256: 56b8b89e4ad6830721a4445c1e788d30195833e719b7c3fed741224ee1fdb7d8
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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