Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ea13ff58d652d7…

MALICIOUS

PDF

92.2 KB Created: 2021-07-04 06:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c58a28524f2c397efef970f70642f98 SHA-1: 4ad2e0c3736d0b7d30332085df10b02a858da332 SHA-256: f9ea13ff58d652d73474d22e6509a44f97b60b9d6dcb7dd4a57144635570df26
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link farms, likely to distribute phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://queure.ru/uplcv?utm_term=japanese+action+horror+movies
    • https://sjalikave.hu/pictures/file/96789921768.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088992537c79---69286666290.pdf
    • http://beijinghuojia.cn/userfiles/file/83473589111.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/rudejubuwixebetobirowen.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/41923fd8d2af18819e9cf81e40657add/zovatoniselexekoto.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3e01c3bc---nexemowibus.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/46991234504.pdf
    • http://hayatteknoloji.com/webimage/file/fupofojuwelesupetuk.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8856056b---51702688752.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98828785020.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cadd0060a932f02f12e38d729206269e/21131457299.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160877497b8535---72463114844.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/kudifevovotiwolovevusemaz.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096562bb6786---vofodu.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bae5270f0b5468ef75ed6d6f0d71275f/63347760435.pdf
    • http://ltptech.vn/uploads/userfiles/file/24924998798.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e35e6591af3624a3d25c215ea2261bb8/98824706218.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/21277d1f9de47d5ee9144e21b4b8b678/vagufoso.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/91620018803.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57cba252e---denolosebipuwew.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1aaccfb5995b5134c8dac6a191b7f5f0/sazekarulobogobanit.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be238b5c419---mugusazikedolebupunar.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/rirekulepuxexibipi.pdf
    • http://plncse.hu/php_data/file/85412490590.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103af.bin
93d8767be145b57f047b04234c61241cdad92790903cce7b401e764156b84c97
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 18236 bytes
font_01_sfnt_off0001334a.bin
d5d774bf761d78e517c0cb887223f581c1b0622081ad50a6519f87f4e5f2b632
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 10652 bytes
font_02_sfnt_off00014b8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8E 16792 bytes