Malicious PDF — malware analysis report

Static analysis result for SHA-256 333794878a7530ed…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 08:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a2eaf3f138ce61db167dc30971b8a96 SHA-1: 2517de38306472382ec5bccc3e8029ce75900564 SHA-256: 333794878a7530edf84ff9faac92f60059cbceb26a1e7d61aec56f3f58bed5aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristics point to a malicious PDF designed to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://cructi.ru/uplcv?utm_term=how+to+use+phone+to+control+ps4 PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/s9u1e4101vd9n9et802n4acv76/nisones.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/fejuriturijadasuxaraxisi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130e36df00f7---jitakesopuzem.pdfIn PDF document text
    • http://lscapital.it/images/file/68829914391.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/fesapefipujazajotu.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/61750749687.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/72242631487.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/fivodipafojomepuf.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/menovasezeve.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/xofarol.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sapejogelinakowomepako.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46270161061.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/44525522885.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/narojikunosizalinemawu.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fizurikekotokakidofivowil.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/84520744633.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/bamibabuxulavuk.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b5ea47ba8eac1312f9cb2b11ec3e8c21/jotavo.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/23320791780.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/virabiraponogadakos.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/61517300986.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pudevogaji.pdfIn PDF document text
    • http://voijin.com/userfiles/files/66977546634.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613897b35768a---47726881106.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dusisibivezedelu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161357cfa4df2c---63707924077.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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 10472 bytes
SHA-256: 58f676304e2bfea62cc6393f4b5a62a597c978013fcebb1b31a6723df6578b4d
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 18116 bytes
SHA-256: bd5ffb0a5f848dfc0bbe1ff2e2c038f6b9c56e73f6b140b8e6ab3dedc2b90968

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