Malicious PDF — malware analysis report

Static analysis result for SHA-256 5962d3ee98c731ae…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 04:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 24deb8b2ae6b7338ca91e45f26ab0411 SHA-1: 5bbde79530981b359a265490a4d77d49d14f94e9 SHA-256: 5962d3ee98c731ae26f9823c5a15fab72b72f20b2646a36056e8c40987d29deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=coc+gem+generator PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9cttfrsbvrsjjvmi0pkflpp1rb/riligarijixafejora.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/dibale.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0d23cea83d2e54b0efa7b07ccbf52aac/75746468556.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/55020169300.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/17102687592.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/69433565617.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/vubobom.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/34176424040.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4605907814.pdfIn PDF document text
    • http://freestyler.cz/img/file/kevosunitoxeg.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/32307019582.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/zavifexagu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/9477425217.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7008c4e2---pelevesepibe.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/88370727474.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161452cde9abea---dozotuputemezujixogu.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/menuliwereva.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/wefarezi.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/98777575307.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/47995967819.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/76782730209.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/nadirefibur.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/nonarodemamu.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_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 10300 bytes
SHA-256: 06f9acc9bef4d94197fdff5dbc4e2c86e64088153faf4eec1837b61c4002a662
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 18148 bytes
SHA-256: 2ec8b51e7ea163b189b2dcb91a0b8730094d51b44c24ec5c13142a651a719f3e

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