Malicious PDF — malware analysis report

Static analysis result for SHA-256 54420e5c3739a241…

MALICIOUS

PDF

98.0 KB Created: 2021-07-20 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9f568329ba302cdd0c31402649eff656 SHA-1: 64bad1b4b3a173458c2f9b9ddc58630469806bfe SHA-256: 54420e5c3739a24130e0bf99ecf5c32e8f84ca397a419da19fe1732e69578b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://acronimocostanzo.com/userfiles/file/97229879436.pdf In PDF document text
    • https://bamor.org/userfiles/file/12603271509.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/49303e0e15b0fdd0f0bf54af756fb7f4/94888941811.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/67923918129.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12579694394.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210514071214.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435650b6df---vabebarewemodil.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849b8b43ed4---mekagodas.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/3003780814.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/7257824555.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a11418a437d---sovoze.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/63864538648.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d204e697b---xisotamofekadegeva.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607288f7054a3---97879608407.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/livegolasup.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/xitamegabedinuviw.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/lowojevawomutetuxarinip.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097637f6bd62---92674537718.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/gitag.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/leposewijawesi.pdfIn PDF document text
    • https://industriameccanica.it/file/gikokapa.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/fazalomopejefijuroponuw.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/61010113552.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1c2e189a---dojejapojekewama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=most+developed+continentPDF 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_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 10304 bytes
SHA-256: b3b44a662256dd1a5f9f0eee91b383d461738fda5d898dfa5fb1622117e2a9b1
font_01_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16952 bytes
SHA-256: 910fd17449efced12c692fe397a7ef0b82ad76519abaeaa74096d364c12627b3
font_02_sfnt_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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