Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dbbeede9906433…

MALICIOUS

PDF

107.3 KB Created: 2021-08-01 21:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ba15791904502657742aae51607b5e3e SHA-1: 023be12537d8088f361cf85d335e08dba04c215a SHA-256: f6dbbeede990643356a64971eb0f0b3d9a6a7f8a7b931692d1a56248b7bb6c4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://catamma.ru/uplcv?utm_term=black+desert+mobile+best+silver+farming+spot PDF link annotation
    • http://airsoft1.ro/files/file/85956041133.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/rexetasudelezolenipelut.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/nurotivewa.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3052d92fc545c06d078f476d4383dd24/gitewusiwipigugo.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/4408144088.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/98398b1bfad66adaa2d629c94d85f3ed/bexoxamowosut.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096134ad7b1a---56324576434.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540b2b7c1c---guzomisefojexedafuremape.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc5bb906c---dowalexirati.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57be833c91---zasuwagopedikir.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6298e7c2---63941701893.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916c31b9fa9---72900667315.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/80867646910.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba46ac67f---wapufokal.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gijelesuzojuni.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/23601148166.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/25443197485.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dobiluvovawutazabelitub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b58878431---78239135492.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/84694658472.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/idpd9fmj9snk3cnpae9a3dg947/dewofajonuzimobujirug.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nabaxilejapopugobenul.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/wigebomudesowuxuji.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zavizotumatekovopem.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d9e6cc543e56ad0ac0422092140ccc34/basixuzosusilonosurezumuv.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gh99uvig7ci927qqj2pq39r6bt/tovunoxujeru.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_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 18212 bytes
SHA-256: 61829ed3ae6e693280b4e2cbde3d060bd5a61a94c4b28f56a787e650ff91086f
font_01_sfnt_off00016bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEE 11312 bytes
SHA-256: b0f5867d4696aee8107feb44fb3a4ecab13052c5e467cffdeb8c0118d1f91b13
font_02_sfnt_off0001862f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1862F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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