Malicious PDF — malware analysis report

Static analysis result for SHA-256 16224aa67c058f35…

MALICIOUS

PDF

99.1 KB Created: 2021-09-07 12:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa28e4c3a841ef2eeae8b8d08edc2a77 SHA-1: bab202cfb85de2293cc61de8705e9627eacb999a SHA-256: 16224aa67c058f355763de7cebe3df54c376c6fae441abc580b6afaacb2d8b0e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41882230f9---ruzivofu.pdf In PDF document text
    • http://yuha.be/_files/file/wabujoduxufajuzoxinane.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/4t2k6ou3r67ebmdnng74spcef1/boxusufup.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160afd78c70d8e---7283421849.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb5b284d70---72589556631.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/geputiwasozadasezase.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/milanolexumuwoduxe.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e2829435bb38d93de8a2f6cb71b22994/jelemafedugod.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/mirorululiboremelemabiwed.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/148418529.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/79044049433.pdfIn PDF document text
    • http://greenld.com/userfiles/87091522818.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202108182242155844.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f924e734eaf3d5444e6b9f1f5b610a2d/bodefupawusijisos.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/igk3t6ohod5jb4jl71j02aco04/vavegisakexow.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624f28e049---6963757554.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f13c031e1ac303351cc4f74cf4c351cb/bajafivo.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/63282356077.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/90dd77c6edc69ca44251a523e855adec/16080694725.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/fojenikasusimipajama.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/sobeba.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cace71e35e---65338956005.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/kkbl6md9j21qraff39kam4mjea/71274441277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rubbermaid+shed+instruction+manualPDF 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_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 19120 bytes
SHA-256: 919b744e2f4421111ee5170a14a78ef5f36b1c95b8a48949a3e8740f95e3fcb9
font_02_sfnt_off00016567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16567 10920 bytes
SHA-256: 44278296c08a6bde746499472cbc91a94acc344bf125ad341327b122c475060e

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