Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aa11b87bde7866…

MALICIOUS

PDF

90.5 KB Created: 2021-10-04 20:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 59eea7d35a6c27a36e0c153a2e827019 SHA-1: f4e171a98b0527c0b64ce6d183476bb656949832 SHA-256: a7aa11b87bde786630a4abab4699302d1c3a52d6ad82f3f60c99a22a91546e84
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://debseven.net/UserFiles/File/75307465141.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140923baeb4d---77341185790.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/59188964810.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/61339701973.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a96fb0e9e5bd48c020ab1e2c23057f98/89487228894.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/jutaloxafuturusidej.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506d918b2ce---56678822964.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/31818807082.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/pejesabekozowin.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/16343268942.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/80258318956.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c2580a0a9ca0ab7fc7e510a40edbf2/vasujuxuzade.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/73356343862.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109301935218859949dd00z78tkon.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/9217837345.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/gufofipijuxaxe.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/bakawo.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090505204719.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615302092d935---27565054338.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bolafigitebaxako.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/todurewinuvudanemejid.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/koboxovet.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210924_7FB17EC5B6BE8EFA.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8d6e46de---67197670225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hydrogen+production+from+biomassPDF 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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 20596 bytes
SHA-256: 730b6eefd64e916a45091a090b66909092c0e01a0c88d5d859770dee113c9299
font_01_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 11264 bytes
SHA-256: 872a040faf94e08d3e8a7c42a119923772bfb42207ea5ee1637aca9ef8ed4631
font_02_sfnt_off000143c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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