Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f07b15faca4765…

MALICIOUS

PDF

75.9 KB Created: 2021-09-29 07:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ef8d07caf9055cfeaa02832457d165d SHA-1: f1673d567410e4306432c99a1386d3f7b84e007c SHA-256: 68f07b15faca47652447cd95a327ba8e2cd37dc6c22ab35508c29b8ea5ceeb9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • 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.
  • 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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2e8g0or8rei8lk8boempnjnh72/nexapalanotetikize.pdf
    • http://csigikes.hu/admin/fck_upload/file/94944798422.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527c0704af---tuzijiwot.pdf
    • https://carsen.sk/editor_uploads/system/files/74486222786.pdf
    • http://mskgroup-spb.ru/upload/file/xivadepowinekab.pdf
    • http://garage-ys.info/js/upload/files/nunezisogozomifaja.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/beneruxo.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/82346038583.pdf
    • http://wine-paraphernalia.com/files/winep/_repo/file/lowev.pdf
    • https://alebusph.centralcms.cloud/galeria/files/denovuvubevugomikig.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/97577840744.pdf
    • https://relans-nn.ru/images/docs/file/tuguvupofowi.pdf
    • https://tch.lu/files/files/56613235247.pdf
    • http://hzzxtl.com/UploadFile/file/20210919163144786.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614269b62b074.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149caef45a62---bemox.pdf
    • http://www.pattyn360.com/upload/forum/files/jezidodogu.pdf
    • http://garderoba.sk/images/_file/dopit.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/20126397234.pdf
    • http://ilkemymm.com/image/files/wirotovawipesanul.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/54307626399.pdf
    • http://ttmplus.com/userfiles/files/fuzopu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf5b987599---44092893737.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=old+testament+commentary+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afbf.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 16232 bytes
font_01_sfnt_off0000c594.bin
2be7fe3513d5222183b892e3153722da1c8c6fd1290fe2b7599343f914415cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 16636 bytes
font_02_sfnt_off0000f095.bin
758d0686bfcc3955cdb0a793554b17566857c47a169f75b8f1fa912869fb967b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10828 bytes
font_03_sfnt_off00010994.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes