Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e05447add3b27d…

MALICIOUS

PDF

113.8 KB Created: 2021-08-20 11:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1c36829f2c0c56f082e817dbc40b9a5 SHA-1: fd44edc87af0a7f54ba0afdaacbaef6c51aa3619 SHA-256: a3e05447add3b27d4c4671b431c7ebc11f6a07ccd127bbf3420b2c107b6d8c2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=yawar+fiesta+pdf+gratis PDF link annotation
    • http://alpha-th.com/userfiles/file/61464353395.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160888dcc6373d---tuborojefusavapevemelite.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tovudixo.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/47541248860.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/td4jmj0t1vetb4jeos46caeure/64366332372.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609019dc580f2---92695516667.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ccnam49lls6ibn4t0srg6m48ml/9207652853.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/11362786787.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/filimonixenevujanuzu.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/mizitizuvugopidezi.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/mifejonosasugudasajeloziz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/47078994e290dde05c52a5cca5b0facc/nozabotoresuzadenawo.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/37452754078.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/4990debfcbd51e3967dfdbdc80a4cfb5/87828538034.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/57726161759.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e16228bf2---tizewowemarexu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609223b10ab1b---xofik.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/puvimebawelibejaj.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b338a2d155375240390076a64ebfb21b/vuxibobananowa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609483c0b1a07---jikeruwuruz.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/alnqn47vd1ig5dq3lqpo0nt8c5/xedatenuduwevasafoketinuz.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/38565719019.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de16c4a2b40---73364872741.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_off000156fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FB 19096 bytes
SHA-256: e97a7c0eec8b55b7181f457d0677e899e3ffa3c3c0fb9f5ed87973782355e50a
font_01_sfnt_off000187e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E7 10472 bytes
SHA-256: a1e18e50a24c83167adc77fe5d4e2bd12a7912f7a5ec76944e1f81e03880120c
font_02_sfnt_off00019fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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