Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2f43000ef6729e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 12:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6979c954a9989f90fcd89e1b7074d8d0 SHA-1: 8a2e738b09055554ee266d36038fb64546c4085b SHA-256: ad2f43000ef6729e0905e92589b808c2bb7d8206069cb2dc590bb58cfbc1493d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://crewmak.ru/uplcv?utm_term=samsung+s6+edge+secret+codes PDF link annotation
    • http://daisin1977.com/js/upload/files/58771840797.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11907252450.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea5cc38f---77338910333.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/poletuwofigo.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/40625259492.pdfIn PDF document text
    • http://receptlap.hu/files/83677215848.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/40411916213.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/merojajududusimow.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/vekusuvekilurinerekilip.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/61549030654.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135748596bca---28316728842.pdfIn PDF document text
    • https://petikdaun.com/contents/files/febevokivitasamowaxoxidu.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/74818216924.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/41566322849.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/poruzeju.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/sekivowu.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/xivepadid.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/tobajosezu.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/93833916819.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/sakagalejowubagasulo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0f0fq9rho700aqcii6oti04bb1/26475184471.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/1037249321.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/54187929384.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0fe9332c---pafujemejurekewis.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/42156393159.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf11341279---994030380.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 10920 bytes
SHA-256: 4a03d5e08b9b80455c16850535e659e3fbeaf9ffe29a2381948d6467423fb0c7
font_01_sfnt_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 17840 bytes
SHA-256: f9b0ad6deccfa6ef0bd0f7a41fd71b2adbe7fb4f264c5ec9d2c3b15130dac4ff
font_02_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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