Malicious PDF — malware analysis report

Static analysis result for SHA-256 1131f040f481f897…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 00:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2591f1a1cfba8139b5ea6edeaa46637 SHA-1: 1f8033af64f5e4749268d5b37fbe86fc57a089a9 SHA-256: 1131f040f481f8975d2ae1093b2ae4a576da1a1b9efd6bb1f00e7d411161799e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm hosted on disposable domains, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. The embedded JavaScript likely facilitates the execution of malicious actions or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tidymoney.com/ckfinder/userfiles/files/siziwefa.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/76453947762.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/49751738598.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///terebuvorepapulageviboja.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/jetofevagabi.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/wugepokutuw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0766120d4---70002209962.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/zireketusitovikurilogelok.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/revejum.pdfIn PDF document text
    • http://lagrupacio.cat/file/7972185563.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16307814261034693775.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0fcad5aea99c2a5b79ee78ca4f57dc6e/melotopat.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/32097267877.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/2103696427.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/ditezi.pdfIn PDF document text
    • http://4darchitecture.org/img/all/69427699455.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/25848117193.pdfIn PDF document text
    • http://biomehl.com/images/content/files/mubovaxusedogomo.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/pipofevapas.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/68752138723.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/silenipetuvepaki.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ralisepujedamatamowupa.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/75696973596.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd0070ca9---kixitolil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bloom+camera+apk+downloadPDF 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 18108 bytes
SHA-256: 4ac39452f63135b04be187bbcf415035194d0f8f7791743b27b3c173e4ee713a
font_01_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 10548 bytes
SHA-256: cfe3b63ecb4addaa284dc0540e3f22aa8c1fe52ec877e36eee60974e1d9b7594
font_02_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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