Malicious PDF — malware analysis report

Static analysis result for SHA-256 77392497eaed3ad7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 11:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1ac4c52a1a21c9af67e45f45cc71a410 SHA-1: 1111cfd6c86a77382d88f5ad50bd9b9f00370327 SHA-256: 77392497eaed3ad730d9be7cd8d303b5eaddb43814bf840e060e771cb84a144b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=recover+unsaved+powerpoint+2010 PDF link annotation
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce299aa06---58595127505.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/37406420803.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/fojikakojubev.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/sejolimino.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/79gb8enf1caj5v13462djs2cr3/zomugumijezuxu.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/welagurejofeli.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/4067345922.pdfIn PDF document text
    • https://robertbah.si/files/file/butoxolunapawusefanom.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/danoveg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df5b311a0---relem.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/33175333415.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/09753c2454f465523432898e10acd6a0/tapipevituvopuneludaxor.pdfIn PDF document text
    • https://equalland.com/uploads/File/27265631051.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822c6c06f9d---xutozagefev.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/gesigofagekibexaga.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/lifimipudi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa9ff059e---roraxefisodu.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezipalanawivofisivuruj.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/denudo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/dfap0ul68bavpk115ejd3e87dj/malulimelumovajojaze.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6f451c1f71cea0fc6aedd308c97ab140/501210979.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kosoz.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/49311832603.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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 20532 bytes
SHA-256: e962c92b6075d39f81f72c4c1f289af248817fafbcc9e896fa0951c2408c6e49
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 11052 bytes
SHA-256: 89861028dd6cdcd4f9b452030155dc2b539a2aee83c5693e868242fcfd0493ba

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