Malicious PDF — malware analysis report

Static analysis result for SHA-256 35787538455a9ea5…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 03:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8ac8d3af5971d8e41a8f3f38d1b5861 SHA-1: 48f7b6a6d6bd6732b4d04a90665ab66b6c112599 SHA-256: 35787538455a9ea5af10ddf83c13ecba8538ee0580d24bb0f7442af8b5df4a27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://capital96.com/userfiles/file/laribidukusipux.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e2a8f1e44d453affcb417b7f6104c4c7/kupuvadamumazatuz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e9e0c7df---zozisob.pdfIn PDF document text
    • http://hncastlecable.com/d/files/xalifopiwimudi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tujoxegobufufituvate.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce835a371e---50990810149.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fd70633cda02210b583bac1366fec452/vuwujavonibem.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/257d3254549f0796267bea8b3d428e82/65551944972.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/gunivajelusameliruja.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e661c6dffb0ff4c859c2738034fac4f5/dudifowupuxopot.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607344f585af9---75027047283.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0ebd799fbce7273cf6c714b0a2d028f/58302314126.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/98568290058.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/g62t0gaa50si9u46bt5nusla32/58744720581.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/20651671371.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b8775705ebdd49bfd78e84f50142bffa/33238343831.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/98b15d2a0eb12776f73bb1a2e1999286/34918943328.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/5r0bg076rva8i16lhpiend5m87/36755698832.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0kdfdnnou1hna8q0pbq88dqu34/tagovumixuvelido.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16232609232273.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ccd7a65a---13538280825.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21423532a---25660862578.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/08d8925111eb4da517e5299c15bc9343/voxuwixovusuma.pdfIn PDF document text
    • http://k1a.ru/images/files/file/21028801542.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/g6ss1vfd81otti9csvh7ij9u1j/21585188273.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/taxametob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mortgage+forbearance+disasterPDF 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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10740 bytes
SHA-256: f6367366f34d0d11cb6843f266209814f62202b7e248cdbfd2a534783a5f6157
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 17752 bytes
SHA-256: ba80e04c0394e7c6c8ced75d436aadb6b8504778eef33c6885f14ab29ff87d09