Malicious PDF — malware analysis report

Static analysis result for SHA-256 788e1381a6415661…

MALICIOUS

PDF

94.8 KB Created: 2021-07-05 19:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb14312aa0e837bb474ad5ae15d90135 SHA-1: 28d4ba734dc95a55dcd9258283092aaf4daf868e SHA-256: 788e1381a64156615458527bbb66121395f425d509e4455816e2be5b2aac91a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://lakesideterracecondo.com/clients/41361/File/21010355979.pdf
    • http://bsa.by/ckfinder/userfiles/files/89592106909.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11b1a06d1---30151521807.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p191toa2hra0h5nf7j4hth3uqk/tinelusakeluzu.pdf
    • http://riverside-plaza.com/upload/userfile/files/26402854503.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2561d89714aa8b6a2470811918f80dfc/32336215589.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160917c499f546---tinugozijedafawin.pdf
    • http://ciarajewellery.com/editor_upload/file/papizutuvaguxolaj.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bdb83f17---vakurazagukafufufetone.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a16fdbaac546392485e38035e922df3/nusesovefe.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b6b705dc---fusidotisazigemutifawore.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071820cb475a---wulifab.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/etjuij0t7lo6bvuqdd7gogsina/mujamabodoredexirolap.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/a54443u15pbfi512jfkarireg7/31795778558.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b3l66n52s5oh2lorndonmm8k79/didik.pdf
    • https://gymlesgeants.com/upload/editor/file/59620678132.pdf
    • https://avvocatoboretti.it/file/95222416105.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/02a09b72452caf489f7dfc56c17e17af/44671191572.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/q8aargjqcsi0l9k7q62fgcakns/1171076217.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411976b804---16098534938.pdf
    • http://bundoreh.com/fckeditor/files/file/tezopekefetijifopozo.pdf
    • http://broeinest.org/ckfinder/userfiles/files/bewuvon.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pb3hnphd88madregvb1f5fknl9/tiwujoxutiwigigibafexov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=orange+poppy+seed+cake+with+syrup
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41e.bin
6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16384 bytes
font_01_sfnt_off00010a64.bin
a91b898ce795dce33b8f09ece84f0691cad01688f7a164365c1f06a6a23661e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 18124 bytes
font_02_sfnt_off000139e7.bin
dedc40cb2123d4ac30c5c4ff32b40cc7eb915ecb12f0669c1dbaa0b6104b7270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 11164 bytes
font_03_sfnt_off000153e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153E3 16792 bytes

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