Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee83a8cb1b3ae86…

MALICIOUS

PDF

88.6 KB Created: 2021-08-05 05:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7957a2a6c226ec67135aa5c0d69eff9e SHA-1: 0b5bec0bc158abf92e62f14171c62f12237153d2 SHA-256: 9ee83a8cb1b3ae86448b13b488c25afb7cb941a8a960fcad883525dfb4da5394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://coretry.ru/uplcv?utm_term=boom+beach+hack+mod+apk+free+download PDF link annotation
    • http://ultrabeauty-ff.ru/userfiles/file/resaxaxovipiwalusovune.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/lijizikoburukumun.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d367f2d03---87678891357.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/48853283712.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/56644852804.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/31510098612.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/98195425628.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/8234677135.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b641201eb---44166295215.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tc5cq08f82oi7nba1mrcgujkin/47604764746.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/95230218378.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/46281239996.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5825c4fc---tidonixotegetavan.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ml3ddtg2nfsecibpqdtk0n00qr/10341821139.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/79509593338.pdfIn PDF document text
    • http://atek-ent.com/upload/file/11797837025.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/6m3jbgnthirjff39gh5oqcd5l5/popod.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/81721927068.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/nilokazopiwok.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0cf070ec---jalijijudedetatufileti.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/50b6oegnlc836rtjubtli0ce46/zisubafaxaxomosajodez.pdfIn PDF document text
    • http://kasargod.net/uploads/file/buzejovogeber.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32366396c---65319042595.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/popiramowiwibizo.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/defagituvopaf.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/bavasesunarujagaginalijo.pdfIn PDF document text
    • 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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 17432 bytes
SHA-256: fe28c697af0a235db8672bedf7aa3cc8a580b84ded79d7d513b4514c1c788b52
font_02_sfnt_off00013ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD0 10900 bytes
SHA-256: 7fdcf2e91c444ebdcedfe810e4c3cd437e5e525643032a9557cd00b730af7a4f

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