Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09ec8c6f7dc0576…

MALICIOUS

PDF

68.9 KB Created: 2021-09-09 07:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6aa34844a8081907e8c02d70d4d99340 SHA-1: 5a486b09f6b7f07128c9c794e678000679598dd7 SHA-256: c09ec8c6f7dc0576109e7bc087d90e64e2394453d0a758bad59568c48d77426d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various domains, with one URL specifically hosted on a compromised CMS upload directory. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

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://nfc-lampang.com/user_img/files/65352673498.pdf In PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/99557321967.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zixuseb.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/96238572697.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/45183247234.pdfIn PDF document text
    • https://shibbirs.com/media/files/41127594500.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0mldpfk6c9u3u98dqhco8babkn/donobopozegosabisewero.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/rinelubukowa.pdfIn PDF document text
    • http://ranch.pl/files/file/binubekogoxeduwovidase.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130296c2959f---nokovegakewoxib.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334a8a52a1c---gonije.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/39318252905.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/lalorefanusininemovo.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/muwuvanojudugupi.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/xivobuvewuxut.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/1977466936.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/84847452231.pdfIn PDF document text
    • https://korankertas.com/contents/files/pujafike.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/basipu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/putulezo.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/misofus.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/xagemazajipafumun.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/1967400735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+5+mobilePDF 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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 14368 bytes
SHA-256: 849ae99a991b41f606b35037f7e409977fcb538cbd0d0d1c4467cec721c0bcdd
font_02_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 10212 bytes
SHA-256: 5d7125178b0000ea6bbbd0e1f8a7bfb4c4826f116205984e7addb82dc7dff319