Malicious PDF — malware analysis report

Static analysis result for SHA-256 a643b14d3ab01f1f…

MALICIOUS

PDF

106.1 KB Created: 2021-07-14 09:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71035a0689074c13e3dbd436c21aa872 SHA-1: f5aad762e9aebe293864ab57672800081ab92d4c SHA-256: a643b14d3ab01f1fd5bf84fe9d6e30c2ffb7b4f3d0392e71d3e810a34ea66467
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content, while the link farm serves as a lure for users to access these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=g%23+mixolydian+scale PDF link annotation
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e772353c1b---diterijalumib.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/5463219483.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/22213011665.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/203c98e5990a9f0feb33a22c20000aea/masobuxagu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a48cdff2b60---fabimobepasuvugavo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/91574f1a5dc1541502dea2442d05f0dd/27466210240.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/41693838073.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2os37hf6lvd49omj7ddl8q1lr6/60070712659.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853bcf026be---pafanuwoluzusitukibuzi.pdfIn PDF document text
    • http://robbes.nl/media/files/memutup.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/furufuxobesiwiduf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2079801a---wiridonaveredo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d9b60a9e7e300154735e5cacf6f92147/12389226225.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/99211761072.pdfIn PDF document text
    • http://allasclub.com/campannas/file/5862833923.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/jomuxejimudiki.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kegutazik.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820dbd11413---33101465983.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mebiviz.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074990a9e5d7---39871592382.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5351c8758---96480925988.pdfIn PDF document text
    • 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
stream_002_off0000e5c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE5C4 28804 bytes
SHA-256: 141ad0c3e3858d64f14639ab209f52c3fd6ac5802555744ed44c7f5a3e94d219
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 4040 bytes
SHA-256: 5accd28b93f88256231765d54412dfb73b7c8b89e0db92651776be48329af4d6
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 28256 bytes
SHA-256: c91439a332448d00aa6ef555205192db0d6daeea1443745d74b89a5b3db4ce55
font_03_sfnt_off00016fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC7 9112 bytes
SHA-256: 81f5683d7fee439b287865b5d77b1a2a7b5e412c9d09ec977eac1b5e7895b269
font_04_sfnt_off0001829f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.