Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e874d203b77a8c…

MALICIOUS

PDF

78.0 KB Created: 2021-10-18 00:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 396e6022fdd515a08553eebeee913e00 SHA-1: 9794527f4f4765df149e6cb6d3c0c9059c98ce44 SHA-256: 90e874d203b77a8c7c3d8e0421544da031b55bf2c94da3d43810372f37bd05f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating suspicious PDF link farms pointing to compromised WordPress uploads and disposable hosting. The embedded URLs are likely used to redirect users to malicious sites for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=manufacturing+best+practices+pdf PDF link annotation
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/99351515494.pdfIn PDF document text
    • http://sinners-party.de/media/file/67118334664.pdfIn PDF document text
    • https://fasaac.org/temp/files/23534500531.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xixigukisekasig.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/83771113802.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zuxiz.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/88516596445.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615157166e075---vafidunegarisovuvuramasa.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zejora.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/85579547164.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/fizanokewabepoxin.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/tusamimow.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/50446082673.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/rosadanoxa.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jukisog.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/xekekafegafakosok.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/kunozudodu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1615005d11efaa---70626522265.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/fivedemimelunuligirifav.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/47746539648.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/05cd9c9b7c0932878e32fc27efa7f4f0/bonegigatunowapew.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_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 16868 bytes
SHA-256: f168b078fd064716d1d8070ae30836c7b286b4ec15b622b89997bf81d023301a
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 10860 bytes
SHA-256: 2eeca2145e387cba69015209cfab3f8027a1f966ddb0ddae0493573d663ef18b

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