Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c93efad37714b3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 11:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f770b3feaf0197c895e8098ae737343e SHA-1: c41930a7f29bad91034cbe0076310d3f1c88ab8e SHA-256: c9c93efad37714b334e881299351a4b69868634ed78e6e24803792107330ff63
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=android+use+sd+card+for+photos
    • https://gruppopolidori.com/upload/image/file/83869481724.pdf
    • https://kawanmto.net/contents/files/61500543272.pdf
    • http://geobigoni.it/userfiles/files/bafopupo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303706ee91c---27921381070.pdf
    • http://vectorma.ru/uploads/assets/file/ralifi.pdf
    • https://newcar-rental.com/uploads/files/202109032333433501.pdf
    • https://tadimtursu.com/image/files/44878919966.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/19388894504.pdf
    • https://tresonance.org/uploadfiles/fexawif.pdf
    • https://elemonbg.com/Files/File/19426374365.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/72189421472.pdf
    • https://zivotzaokny.eu/res/file/gijinixaronebakofol.pdf
    • http://mim2010.ru/userfiles/file/41176530298.pdf
    • http://www.cafeinca.com/img/public/contenido/file/44928373654.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/11297682437.pdf
    • http://ajtoablakcentrum.com/_user/file/50776746506.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196d4bd9bc---ridamexor.pdf
    • http://thibangoto.com/app/webroot/uploads/files/7865781108.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/d3pg3f4kuj98rgnn2j9d1ddjo3/48084847537.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/63006860000.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56281895172.pdf
    • https://takipcisec.com/calisma2/files/uploads/safasumo.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/46629444988.pdf
    • http://dreamsurgerycn.com/ckupload/files/mupulepeb.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_off0000cddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 16792 bytes
font_01_sfnt_off0000e5ee.bin
517e874cc394b4b91861450cbd664b494f8860b76f677d19983bf379f30df650
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 18564 bytes
font_02_sfnt_off000115f4.bin
65236f5ed09713caa5b5ba3ea29fc7624b1608a3e1b62511a97c4de6c496823a
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 10752 bytes