Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee3949a7ecb8052…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 03:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4addc9b7aa7f3761d29ea2ba32898bb7 SHA-1: b3c0fecabd01c50ea727b51171c74d51c7f09476 SHA-256: 9ee3949a7ecb8052ddaae229a864e15b1533fd60d478732749590ebfe9cf46c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://msslink.ru/userfiles/files/vemopiji.pdf In PDF document text
    • http://tion.hu/upload/file/zedosusabejujolira.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614963dd4bf4e---dazegamunazizajiji.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/77976081581.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/gokokuguvolezixetuvos.pdfIn PDF document text
    • http://ymmicro.com/files/files/92592389149.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/60794346018.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/nuvojolilowab.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/56140350833.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/xozisavidimiv.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/65470858874.pdfIn PDF document text
    • https://phuquiland.com/upload/files/verazawivaginabanobu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d3b81ea8---zomopedokawop.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/58105142203.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dakugirewenag.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4924c591---sotifajafitiveg.pdfIn PDF document text
    • https://reniuved.it/file/wozabivepemiji.pdfIn PDF document text
    • https://onlinendttraining.net/files/fipoxijorimezuwar.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/98479248237.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/26981517863.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fozunuwuke.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/dapazi.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/33011553317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bully+game+android+apkPDF 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_off0000b2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A1 15504 bytes
SHA-256: 920e3836a9fd2dbafa8a2c3f13744147d912c8d6cf5fe435c051a7d187a92485
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10828 bytes
SHA-256: 6306b8c102eb032e3be612e60e02b1e0262337a3b8397e2d42dcaf052ddc77f6

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