Malicious PDF — malware analysis report

Static analysis result for SHA-256 449d37376ef1d3dc…

MALICIOUS

PDF

92.3 KB Created: 2021-08-07 18:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0eda5e317fb49e047d0288e517b3ba7c SHA-1: 284c607200defb6a08cdb71e50ac8e07928b1d35 SHA-256: 449d37376ef1d3dc7bb8faac973ca1eb16b0d06e534adadaa99df1785a20f3cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign, potentially using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zlatartopalovic.rs//files/zupiwape.pdf In PDF document text
    • http://unityproductions.com/upload/files/lejemudaresil.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/41f1cd645361e40661a984e6e49f6a05/6773585942.pdfIn PDF document text
    • http://kahasat.cz/data/file/15580631144.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/p1k5cc5uraanq26ndl8906d6hb/nizage.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/32539557568.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ukbvnfgc5o9jh0jprj51tvc66h/kavosa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e30ab740edade59f8b067c827d564b49/92421939684.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/68469548441.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wurasutemovogemud.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/ziwanufapev.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc02b98f3b---gufeno.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060108094373499.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kewokakawopovoko.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/p6idi3ko4p5j857ton5p954ccv/39924190897.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/90123189577.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/bizomirajabixego.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6c2a6e9ee---gavaziwopidepegokokej.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/rewuxela.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c602fb89f30---kexubajimusikapibudi.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/89944466494.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ds2su1m5e01hl08p0erce8du5n/loxufugawib.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087836f8e809---76268133903.pdfIn PDF document text
    • http://atomleasing.ru/media/File/72494237038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=qualcomm+smartphone+write+imei+tool+v1.01+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000db25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDB25 21308 bytes
SHA-256: 4fa06276e9c7c595add6dafe23bd22d6b4748d920aa91f8e0c9e44d6dd170dec
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 17204 bytes
SHA-256: a1e18c7817a985235dbda75bfca32eaa09cdc9ce6b9606b7c3e21878cc1e054a
font_03_sfnt_off00014572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14572 11328 bytes
SHA-256: eb7439a4f0060021b9976ce0d0eed3f06ce597fae1f85f654dbeac3eae429bba

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