Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ebcd967d057d82…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 11:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e59e43b2f8b31ca5ff87b8b3438df8a4 SHA-1: 17ac68711499931103587c54c48f00b2aef4d9e1 SHA-256: b6ebcd967d057d8222fec2c56c4c4588e4f282a229f2987882b77acc5fe2df1c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The presence of a QR code lure, as indicated by the 'SE_QR_LURE' heuristic, suggests an attempt to direct users to malicious content or phishing pages. While no scripts were directly extracted, the ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kowel.com/ckfinder/userfiles/files/1632337057.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dndl1j62qjb85q8nob0rfr15o4/44008323069.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/pajopifewitijosafomol.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/makerobup.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/tenumamenoma.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/53207102771.pdfIn PDF document text
    • https://n-tlg.com/files/file/dasedezikokotulewopow.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/27289998915.pdfIn PDF document text
    • http://ducnhua.com/upload/files/79063891247.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1c191a9023c3ddf730e3c078c015bcc3/94989202701.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/tevazedi.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/sokewebefezejira.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/74415887595.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/kasoxowiwebakatogobavox.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rufodefetijetapebe.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/tufexitupijata.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161408ecc1c5c3---82704916722.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/80848729366.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/73648082248.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/gasaratuvubof.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/85442019932.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/36731825463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=qr+code+in+chrome+androidPDF 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_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 10380 bytes
SHA-256: 8deb7ad5d3e734fc29af05e7f4c93291de51661df9f159f0962a66685987b9fc
font_02_sfnt_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 17864 bytes
SHA-256: 1ff381bc5100316e92907eb7ba096b6fc32b83bb5fe45f197dbef3a10e2a8bc3