Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0636c141261ab90…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 10:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b3a817a955709ed54e97baf1d87eb04 SHA-1: 7b76e0b0bee24f2365d99ec0359777e25f1dc29c SHA-256: c0636c141261ab908ed1631ff8f1cb9f6b3edd794aee14957b90ecb59df4f8d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rosabaum.de/web/editor/files/vedoliloludol.pdf In PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/gegexozedemidutu.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/piliwa.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092323052973499.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff36b326a---mevarirujifigekeziwemodil.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/bemipijowevekobunobidije.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/890b2303146a12faed2c7e61d793ce73/musonolej.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348ba53b0c3---9194646249.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/guzam.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/37605ecc559ef72a36eaa18ce62f8424/mejijituvexuvedot.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bemarasijusi.pdfIn PDF document text
    • https://ags-car.com/upload/files/97722238663.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/60498166127.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/rowisewejanivoruwavaw.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/watilukekajopi.pdfIn PDF document text
    • http://skupka23.ru/upload/m/nuwajuxivevimivuwovufeza.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/nazevure.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/86495046333.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/mojifubarogaliramagi.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/24203912290.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091712015670554.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516a3233eb5---76672891029.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7c8f1f12763aeee2fe71f76f3ee5d014/gaworujuguzavamurut.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/joposebiwoki.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/jetat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=aplicacion+video+star+para+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_off0000b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 18208 bytes
SHA-256: a677be8c87498d2240418b77116d74e2ea4e354587e5835a2af3343a70360b38
font_01_sfnt_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10556 bytes
SHA-256: 1944bbcba6bf8c079c7a02bd1b9b7a994327e54d90c173ab3bc290cfa550e04a

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