Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ecd67822116377…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 19:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f2db601cc1d3c73d74ac4d2e4c4288be SHA-1: 2cfe4f9e49c9096a8dbe7464b2a498f6bc593160 SHA-256: c4ecd678221163778039c64df470a4083da01b523b74880a3b7bc1140d0fc64c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c0935496---garakogotonomutib.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adamlegal.com/userfiles/file/19312988432.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/duzarusanitofejad.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/lemojez.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c0935496---garakogotonomutib.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/4824529949.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qs4b9548ni1pe5dnjm2mnr5ls6/7449332200.pdfIn PDF document text
    • https://anfauglir.com/images/file/butunimogavexazezorawuva.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854543f4057---danegufuxiwaxutuwog.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///17913640613.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/en5uqtg30gtir8s3hlu600f0t4/jemozarewefigesepulatetov.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bb087265---37648744300.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/zuzipomizekibikaluwoba.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/gepigi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xavotusironegob.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/robiwudadinepefeg.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/94608540217.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/86e6b00d8d6dd605c611aa3f0d6b66a8/tofejerimim.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/migewujedam.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772fc01d38e---14257292753.pdfIn PDF document text
    • http://dentherapia.hu/files/file/18197780583.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b593db15ecb---buvimiz.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/87432194229.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/65982903692.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/4k0ehd7ag6s8vg0jemrsj9i3fe/radubezutawixijim.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160755f4086155---52718512075.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/42812447548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=compress+pdf+how+toPDF 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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16776 bytes
SHA-256: 41d7a4e9d682a9679c3dc426c96ac361590cc1d4d92bfbb4e76f1df4fb05205d
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 10476 bytes
SHA-256: 9289d040006a17ae4a85a3b0b063a06233c2599a8ccfa55800f45d64277348c3
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1