Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f02eadcd111da9…

MALICIOUS

PDF

88.8 KB Created: 2021-07-07 01:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cc3fbacfbc434f51b4d38e9400a9cd48 SHA-1: 350b0071bd63868a0a847e8d33adda0907b88475 SHA-256: e5f02eadcd111da9406ab8f7e7afd24f1d0bee2a3cae4c0e6d87d977265c5445
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/04bc5578ca394f713a1ff215845d4d97/11189217051.pdf In PDF document text
    • http://surtek.biz/image/files/20150114_233644.pdfIn PDF document text
    • https://datawire.gr/files/files/bolopetizepod.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/85560274363.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1ff050d5---97588417757.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0493baa9c29710d1ddbeaa897e0b64c2/26530840956.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/665kl6ccfteb5p6bmkj9meqjl5/31323420346.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/53673224040.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b6243ac103c---17743330073.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9209651c---17111389845.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f6136b47ee4736ec9cac437f29b24957/jemobowelevizom.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608610a7578e1---68031577469.pdfIn PDF document text
    • https://paperland.bg/uploads/file/xoruforawovanuxo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf14f2ab6---82872851095.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeeda8072b---newajilobubilono.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/vasuwesojitosafetamav.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/97963525640.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/nabopoxumojodonigubon.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210602185212.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/at6enbh5kv5j64mc6nvrlg2luk/muvajijawalimepiz.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/nuwaromi.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608347a262b52---26149363277.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5ac12c04---14195324024.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/zojoworibonodaxanuselilis.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/18269384418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+build+a+mansion+in+minecraftPDF 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_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 16988 bytes
SHA-256: 4ef4d71f410bc4f8af42faa0dee3be1f4a993983272ac132e0b2e1103c2d3618
font_01_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 10952 bytes
SHA-256: d61015777acb11d28ca36a7975b1a52f5d4de7fb6a91361b52d5ff26b6f0e55f
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1