Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9cc60b36dd09a6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 13:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5936b65dc91b9efcfdd4e04496857e4f SHA-1: 1a72992a8e09c5ad82016c6188f648b54e90ae07 SHA-256: 9f9cc60b36dd09a67ccd111a937b18ce29978f236101e8bd675a937c959d3455
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soudureornementalelauziere.com/upload/editor/file/kalinusedexawufeb.pdf In PDF document text
    • http://serdceprirody.ru/userfiles/file/71705571781.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/lufekisopog.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/34965860922.pdfIn PDF document text
    • http://calisnt.com/uploads/files/vumewiroselixazidavoga.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de96bda54---sekoximebadokivamelad.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/sumirinu.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/74635523509.pdfIn PDF document text
    • https://anjingliar.com/contents/files/12808497142.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bf04cc87d1256c48d190d0480d3790b/lulofufexokegunorufor.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tojakozofori.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13626676115.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/94214642406.pdfIn PDF document text
    • http://hadt.vn/upload/files/manulifalix.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/63469239974.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96671201441.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/20049193523.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/54692967125.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/28226936541.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd9505c50---26409576255.pdfIn PDF document text
    • https://j26clean.com/upload/files/37595662037.pdfIn PDF document text
    • http://mfcpavpos.ru/file/82212538968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=war+robot+mod+apk+unlimited+moneyPDF 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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 10824 bytes
SHA-256: 159801143ae92c95368d83c1d164d8959587a4c99e69c515d9b0998225c395ab
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 19048 bytes
SHA-256: 87488e90a4cd8fdc5572bbc98a1bbfa7447d8f1e29307fc5d72a8230ac91f1eb