Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1e3d3c1a2625d4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 09:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c448c86f57ca50b8c4626e6a2ddc6dfb SHA-1: 56b121ecfbeb4e7f8f510badfa7892695c1b3e9d SHA-256: 3c1e3d3c1a2625d43e5518846a2ddf8af25e2eb59e7e71d74031c07e5f960f3e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations and disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b0e14d0ad54a28b02b6773c0ea824743/pipokuzevalo.pdf In PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/87786797301.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2a2e5cbd1b00fb4147f288542851530b/1535183525.pdfIn PDF document text
    • http://video-cycling.de/files/file/29642203895.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6046ec1f19---lamipebasa.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/24798672019.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b433bb04329---fogowofote.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bab398a13cd---66316188006.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/sujavizoxifof.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d37fa063e45---21401372154.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/merowavezezejifujalaron.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/82443598185.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4415ad9000---41330688581.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/64725587959.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/84639663291.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/188f0340d46323b39273697dc5ee7a70/vajepabanavupiwopebutax.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095e403cfab5---48542624974.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a130d1480---20492456120.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/luzefin.pdfIn PDF document text
    • http://paliukenas.lt/i/File/29430708041.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/11906511120.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d88a79846c0c0b49c59b83037a2f125/33828406946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+anaerobic+and+aerobic+metabolismPDF 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_off0000bf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 10864 bytes
SHA-256: 3ca06f9d43b13220184240713adf10a1bb08e8e7c9dd567867064bc170a514cb
font_01_sfnt_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 15776 bytes
SHA-256: ce9ef753d87a3d5a3a1ecb97cccdb8c65322c55b05da24a9197429126e8742cc