Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5c19fd40be78b6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 00:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c0faabcbd5f6832c0dc6f015a4bb08c SHA-1: c6629a02dac4e1bdce313fb8de243176da01cebc SHA-256: 8a5c19fd40be78b6690f396baaa393c4e2fbcd8d1fdaa8a60f1756854bcd6fe5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics confirms the document's structure is designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/29866dbec3870273fec1144f9c73f4ce/50711260998.pdf In PDF document text
    • http://steffis-strassladen.de/userfiles/file/putapumuvo.pdfIn PDF document text
    • https://dafelia.com/files/nagedatiwerepifanuvon.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/jetutuk.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/kefoxudit.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/jejemewebufefagatikeze.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lp2v41dpdieemqv0pfa7c6hqrl/rijedunevapibares.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fiparajemewina.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/66827002207.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/17518888914.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/16906889489.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/992e9d2e4d319a3867f5f40807f4176f/83213002425.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/93528165490.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/moxuxejajesujuvexirob.pdfIn PDF document text
    • https://red-adlay.com/upload/files/67866821782.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/37216264199.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jizudibiz.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/zopusejamejowe.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fomasuwuku.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512644a8dfd---10511880942.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161426507d848e---70399107885.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332f7556b00---88888423186.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lunibidoxubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=trainer+of+monster+mod+apkPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/85555304489.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_off0000b3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 15968 bytes
SHA-256: 07604aaef28554f0044692ef943da67568d9508167bb5564e8845f4dd2b64a19
font_02_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10668 bytes
SHA-256: 7a874cc030385850be75eb99345800ed97184a149c3b3678a4645bf09e321e1c

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