Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7adca5f1d11034e…

MALICIOUS

PDF

82.7 KB Created: 2021-08-08 23:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 07a935331ad4d148fcb5b161828cafce SHA-1: 803ab7f21aa6550cb421f955e880f31352323ea7 SHA-256: e7adca5f1d11034eb840d0e09f1ef499e32724f3c84275eaf8e7d9ce8016ef4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d1e4fb24---42286383019.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612245fbb5---fogepegogugewe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rm5v3ka4quh9m3dm84sjvfvkoc/61213796683.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716ff8a09a6---40160350263.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/remipekemeg.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3uega0hs8ca9ls6mgqhoqi2l8/wuvawuzotivifub.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/perujosoweludejijoz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c795b8b51af---vulutapuniv.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/gakedugupil.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/nuvobusesu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/91736093338.pdfIn PDF document text
    • http://chikatere.com/Upload/files/50709319228.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/vewarozoto.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e6ae4d6d---newavoxovasumoju.pdfIn PDF document text
    • http://alkanboya.com/files/file///zojakadidixi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1a1a4f39---bamozisadojutobidu.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/89073977838.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/16854690109.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/runurelinadoziwejok.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/72231995869.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/50087622005.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/93936159717.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102e417b8ecc---regukeruvapado.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/62009206206.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/sudumavujutupikekozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+get+free+robux+may+2020PDF 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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 17500 bytes
SHA-256: 554a315e7e84fbb1efebb5a481671b3ecd127ff524c8eb78ea1294feaa540361
font_01_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 11060 bytes
SHA-256: d54751ab146a6a250f71f1e10cfd140eb883ca4520b1ecc4128b791a2603b337
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1