Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf1f0a37f6cbd4d…

MALICIOUS

PDF

142.2 KB Created: 2021-08-10 07:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4d15476e14963cc7358c7bac38714aa6 SHA-1: 861b982b37bce5acc802ea53434ec55e44326ec5 SHA-256: cdf1f0a37f6cbd4d60a198ef995a4fec02c8d4758f7d17efa28469ad5f34ec38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9688

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fda384f18---64761523963.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed7ad3075---teduxinef.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/97009748039.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb18ad8b3---72544315871.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/vevimugemu.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/60889815312.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u6lsgs9v66frck3f2fjl8hmamg/jumukagoz.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/25280b175d807d5c259fbdd6c44b5dbd/90037148510.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/83829347281.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/4445851365.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78545f0293---zinatawajegadejotasaxad.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/waget.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bab7d283---21591018667.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/39656262334.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/zetosegimitanozalura.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pipavusipo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d42d836---danegifalejoso.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/nabinepazosugalatigupoxi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lqpabhg6n7tecv4ce2ag5govc7/61792472089.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8867d792d7---sajovefowipulezazaj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d276020e7d0---matujevobolilokowod.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0fnqh003r4otlc03nf4a5k25n3/xugumasisaxusavomusi.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/bedarenodesagutidowu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/j8scuo0jlqkpbqc9hs8jp3hf77/63036385626.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc0771d0a---fusadumupanabuwozeb.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa2b2173e802e29a33034c27f31dc8b4/66788673509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fnf+unblocked+games+76+sky+modPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18254 20192 bytes
SHA-256: c82eb612fa5b8700cfbc6ccb66dcfd7b3aeda2d77536369a3134fda47d762022
font_01_sfnt_off0001a515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A515 11172 bytes
SHA-256: 3bb406af2855a493959c78867218993e0a0dc0feb21b5905d433d5d2ceee3ca4
font_02_sfnt_off0001bf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D728 8960 bytes
SHA-256: 496c4da4ca1d7cbc088120fd155932abda484930d4f79f3b81bf0e84d9bd656d
font_04_sfnt_off0001e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E98C 25432 bytes
SHA-256: 824e0be4f317eda6a7dd2d41af67b13141be7092b7ddb0d2ba439a06ee4dda49