Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aad7a89cfcd3d2…

MALICIOUS

PDF

75.5 KB Created: 2021-08-07 16:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58e4e1dbfef47066cbab97a842257c11 SHA-1: b304bc9190855a4893ba32dc9aaad9f4818e12ee SHA-256: c1aad7a89cfcd3d27abddebd6f952ad1d73005880a08af3c870ef245a9453b43
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, many of which are hosting other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or to serve as a distribution point for further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e12763a11---bokiseb.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/99b65271c7eb1a3cc42f9fc18fed4d96/gazajuwapufenavanatexu.pdfIn PDF document text
    • https://tavio.ru/files/file/75033784928.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kugabelosu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/18ffee6b188beb71cd164a274ca79459/36351156451.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf9de2b77---rabomagibakufif.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nopebonujefapobula.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080403213478521.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sgtmfg76s3qjqsn4r1ig5itcb2/xelagepegumad.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210713231216.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e71dc36a---82981348387.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/fupemanovukanodawiro.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/64573462602.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709298b5dbb---25527863306.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/85960978369.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8be6f074e---labenidigij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b097fc794d9---1725593928.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wofoma.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6239ca49f9ea3769873a0237c1e4af4e/relaberifilolob.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ce41bd68d726ff0971d208cbd32c65f/tinadakalumanomiluvatasil.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/61bd80c5a4cf8a90ced8610770890540/84387390561.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lolebabekamutasarakafid.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bowige.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7e3de0fc---sulojogekun.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a086edcbe4---8537668723.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/kosusofav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=activate+piv+certificate+on+cacPDF 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_off0000c4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 10308 bytes
SHA-256: 7c0044acecd509bb3740f32f3a3913cd2fbe41c9678cab81387d73639e5e862d
font_01_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16208 bytes
SHA-256: 1a4cdc963586e211d28ccc76b3445429bdb00e28a9ab5b91de3f3d88a4646175
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1