Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1ec570be1a0acd…

MALICIOUS

PDF

105.1 KB Created: 2021-07-07 03:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73635fe531157d841ee51eae56184e66 SHA-1: 3b7f14d112969a5368e0b0421d77a26b6a01c4d0 SHA-256: 3a1ec570be1a0acd2131ad3ace69a1e1277c8442e004cfe5116f3f0a16a5e97f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a component of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738dcc73afd---widexetinivisafoxevamipul.pdf In PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nuvumetuburabe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f8ac17e9---bapapakupofixaniki.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bavojuze.pdfIn PDF document text
    • https://yellowstonewildlife.com/duwoveza.pdfIn PDF document text
    • http://palami.by/images/file/gowukegetibavaguduzadeg.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087469c84f35---57424921222.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bfc750ced---dowajegalovazovoke.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/semipopifonodugaxilu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/57265298693.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507072750.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/cb28d79a5a7f89a188e05b0ffabf7a10/25557719843.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/63944327517.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/61990693012.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8683c04c5---debugujo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609329e5570d4---lizupe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0855c5822---42979017438.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741c31a5c49---6840046765.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jubededutudulup.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rukenevoluxuzaxaruranovit.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/suluvodelenifalasafaraja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jeepers+creepers+dayPDF 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_off00014071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14071 16044 bytes
SHA-256: a20bffc01af68c1d4f0a27591678aaa533adbed3803294d1d94dca49725f7bf2
font_01_sfnt_off000169dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F3 10152 bytes
SHA-256: df1f2cf07ad111ec4c29d3a00176e05677e1071577501058024be1ec494bdbce

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