Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd62df08da15073…

MALICIOUS

PDF

85.9 KB Created: 2021-08-03 10:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d57ea9b861cbf5833668acc1f588146f SHA-1: cd8f87d9ac237548a4accacf7e96a4b1cae98fbe SHA-256: bfd62df08da1507326adf271c6c1c0102d802c15dd9aedd17469f1c529d416eb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories. This suggests the file is designed to act as a link farm, potentially redirecting users to malicious sites or phishing lures. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://americasbestwingsbeltsville.com/uploads/files/84410238649.pdf In PDF document text
    • http://bkdesign.ee/userfiles/file/39465474060.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2eb2e19b7b07528a906089a4420b7f77/bifezot.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/86478709905.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160970300d39d5---48210069887.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e15f44178b2cb5690c56c2cfd4d2128e/1945222897.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/dipizovusofabata.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/208sd3csd9bdtinj1sf17ghek7/tuxivusedolukogawak.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3141ef2981---71590689879.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/sezufufutaxojedatiniwazu.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/45918715973.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096c45115fb9---89281905874.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/74844078721.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/33375780741.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf7436bf5---tegexubakoj.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2036a44c9---40192847435.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/65888564048.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/95ndicpdf3jbs01gkj4g573gp1/72388425283.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803658a77b6---89352875718.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/dozevabijojuzego.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/17420929082.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082005780eca---zumopuja.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5729c5f52f30d66a26f57b7ae4ed0f19/dipev.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/4620802378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nicene+creed+episcopal+1928PDF 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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 16352 bytes
SHA-256: 9dfc68faadaaaeb8167431f396cea2990a02393481e8b10fdfbde17d5b146dc9
font_01_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 10936 bytes
SHA-256: 57af0f4eb5c257175591e1c8298ffa79080ed098ee12081c81b6f55e69f1fd95

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