Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c3d2c7b1f4fbda…

MALICIOUS

PDF

202.7 KB Created: 2021-09-03 10:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb11d55599fafcac304eec84cb3fec71 SHA-1: 7bdab7bb58fbd635efce22c10b1146b489b0a03c SHA-256: d6c3d2c7b1f4fbda760f2b7a2d6265bd5527f5c7d22d78d8bf2327b4ca36ec70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, with several pointing to compromised WordPress upload directories and other unknown PDF files, suggesting a campaign to distribute further malicious content. No scripts were extracted, but the presence of multiple suspicious URLs strongly indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

Heuristics 5

  • 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.
  • 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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5b87d782---71858677524.pdf In PDF document text
    • https://aedwea.com/upload/foto/pofowititufowub.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xedetuvigawafol.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/38knfvj4ui0jmb0gen481a08er/62289016096.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kukoguredafal.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbtgom0a1sd36v0nbe0jgleh5f/rijejem.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36ba78431---fajizuzubarilowelemibela.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/wesajuxulavazixizumex.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/361692cf558414b9acf9f36fa99b6520/19362727769.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe5958a38---mimasa.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/68744669853.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/59549347933.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/25dsd8puuo9rfp45ksgurle2jb/40114207463.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/6144016950.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/34535075873.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b1759de8ca284c95edbcaaaa79fae452/17744701325.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ad58649c---34697363718.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/mijizerekevobiwolawum.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/vumixomevupelakug.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/63048812746.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8f2e183e9655b89cac8ad19084de0cd9/54547179694.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210808220540.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/i9d1van8f6oc2qe4dq9cmsubh8/wadenurujetonamoneg.pdfIn PDF document text
    • http://anm-av.de/uploads/files/baxubinoxegoduzasivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=medidas+redes+sociales+2019+pdfPDF 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_off0002b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0AE 23548 bytes
SHA-256: f79606055cb1dda1b8bba0ba41608f49d35bd31d5a97bd31aaf9079ebc5cd142
font_01_sfnt_off0002eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000302e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302E1 10868 bytes
SHA-256: 3cd762e14cf7b85c8e2b1476079e5fffcc3ec6712128fbf282a44b8bfb9c0673