Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9a60a6a19bdff…

MALICIOUS

PDF

76.3 KB Created: 2021-09-26 23:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ed7ff749a97115ced69a182cdae19e2 SHA-1: 6c20acdd95714d17104809186743464fe1e56bca SHA-256: 8fd9a60a6a19bdffe1b44b3afacd0333dd94e18d794e14a3449813a2a78909a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The primary lure appears to be a fake search result for 'stephen hawking books pdf download', directing users to malicious URLs. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=stephen+hawking+books+pdf+download PDF link annotation
    • http://dungcucaytrong.com/images/files/davivafutat.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/mazude.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/36bfb7f8f9fdc3c2e07b948e0f94e1cd/58217399767.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/ganegifelabekoxumuluvoda.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/157fe64830ef2c863c591f373988f840/biweladedevofuxosimefab.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/kaguzipofijub.pdfIn PDF document text
    • http://thongthien.vn/upload/files/xulonikosagapuxida.pdfIn PDF document text
    • https://hirurgija.me/files/fuvikowati.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/jawovanag.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/kipelujenoz.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/kejiri.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/9465604036.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/bufixogaranefonubujozezen.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/vupuzijarozoji.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/76549534830.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd879f19c---dosesumede.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/74141597561.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/35170234751.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405dfcd23da---93490228531.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/45662eb86a3820aaa1b7013f43918af0/7764172549.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/31174292720.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_off0000bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB46 11068 bytes
SHA-256: 8944f6357fe88ba2c3671545f675e49349539b958660022be0793f3a2ebe47d4
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 20984 bytes
SHA-256: 06ae4c9a86c96fd039fbc2c5f2c7fb775e91532e2b672976cce1ff1aa868a5ac
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1