Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b1b255f1c1b48b…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 07:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 58385fd7261acfd4bc505daa1a98f43a SHA-1: 64766181981c6c6a88ec5dd7981953cab3d46439 SHA-256: a8b1b255f1c1b48b879299c6fdc14f099ab6be8e99744f8c229365cf41ed7e17
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 0.9990

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 https://coretry.ru/uplcv?utm_term=manny+khoshbin+contrarian+playbook+pdf PDF link annotation
    • http://mobilni-kadernictvi.cz/files/file/josikepefujemowawiw.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/nowom.pdfIn PDF document text
    • https://mvservice.it/file/73219373013.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/gasifedud.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/317013349.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608221f5a2a6a---fepevel.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac2c5feb685749a9eb4b51dd9387a5ef/68937529354.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/mefoverugikej.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/57948244447.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab61da942---82953972891.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34082e2799dd82996f7c266a670ba073/41748755694.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/v6443pie4gjntapchio0juc8ic/kidibuseseromarufixoriz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e676af5ee23---34865947973.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gajerixilebutegukiju.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pinolesamijizafarejep.pdfIn PDF document text
    • http://blueyee.com/upload/file/170904195258.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a98a5b4bed79203f0568c00076f7c6bd/26453006825.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b778qfakpoumtsuiaa8afua1t3/15269777566.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/88363160371.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/51076513f71688951af7185214fb2b5c/63063577918.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/81541162101.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bef809b1eb398e4415b8f6c8baacd68d/ropidemigeratedowoz.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/dozadawaw.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/85qvfimkh6h317286vog5lif8m/nimuxiledofuvup.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/41248048259.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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10924 bytes
SHA-256: 4cea999808e37a3ed2078eb76d055620dbc24c599419c6ddfcee79e4db3e6d91
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 17320 bytes
SHA-256: 7ad3c3068c16688a9c427ab4723f0e7c7706cf328ebecd8a623085524f50fc33