Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d7ade993b2af9d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 20:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 541d8779d7745e0f1434bb10f3bb1e26 SHA-1: 6b4879149fa24879b409960c2f26bfdfaf6659ce SHA-256: b4d7ade993b2af9d5a4dcea9f18c68c0849e3b94d1c432e9d35224cffb70bfcc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shinhwajudan.com/userData/board/file/2213563431.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/gujizubikazos.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/numijuvigewaseguzi.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/sunakawakuforawamoj.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/63996379950.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/mokewarididifukazu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7bd174759b367fefb13b19cce0b21c65/37419156946.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/juzepowasafuwujedorufifel.pdfIn PDF document text
    • https://esvigo.com/upload/files/63627045204.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zozenoj.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/59493993398.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210910_B05791EE3A8A7CDB.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/11575431366.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/ruloje.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xurukumi.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/68220562767.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_76FC87D9D0B34902.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb607455c---58886201322.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/revijubujijadikari.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/ludosofawik.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/4461328817.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8b0b0836---viratetuzowabofovuwizere.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/fewamifabejagasupe.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/79180707172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=keyword+tool+suggestionPDF 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_off0000b7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A2 10552 bytes
SHA-256: 7223657b84c351b7cf3fa8363e475dad59d9accfdd064ed48dcbe119ac9f085e
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 19236 bytes
SHA-256: 266f3030bc45e0ad2e8e15dc390ab321784575e0d1b176b745529957d8b81d78
font_02_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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