Malicious PDF — malware analysis report

Static analysis result for SHA-256 b175465311b858ae…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 19:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfbe76f8d37c97831b1e3432e1256876 SHA-1: 376cac742f63f680c2a2a20eb97236db1eb23460 SHA-256: b175465311b858ae12c1979af0cfa39eb1fbd98c4923d6a6d039d08206e40f79
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or submitting sensitive information. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myepres.com/HotelEstimator/userfiles/file/minosivufivofus.pdf In PDF document text
    • http://healingtown.org/userData/board/file/75324662689.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109171355243134.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/91717f47305a97c38a17682b46f76c29/77268418654.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/bopigovarejepisijikasabik.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/tugitiruvuwobedizi.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/43563245523.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kajosawenowaxegaza.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/lufebafe.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/pubakotapeme.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373e11e7d71---56475469924.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/zukegabugelib.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/58607773218.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/resavijisafiputofoliwut.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/174193472.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/dewatupo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d60573e3a---12662625876.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312999643759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=import+ringtone+to+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_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 17128 bytes
SHA-256: 5a2f79593075c9776e81b3bb563069e25e461e6a143ecbcbc1b8db9e766273fd
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 10472 bytes
SHA-256: ae9c10d9f4afad01c22b5cc190decb9fa2379ddc81ef10b91adc49a6676f229b
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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