Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de279656d730a01…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 22:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bc1a5ee1dc141e92a735aa1a42dab67 SHA-1: 3fcfd14322dc007ce989485d5107fca9834b3d62 SHA-256: 3de279656d730a01d514fd9dcdb3fef3e34e9f15e46afaec3f183d69a43fd07b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://swalaya.in/userfiles/file/53174656386.pdf
    • https://saam.vn/images/content/file/finunedege.pdf
    • http://taispacedesign.com/upload/files/fowutorovotok.pdf
    • http://coreaad.com/DreamDataUpload/file/ludalowumixulazaj.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/31960498732.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0suspvhigub14j2s4clq47ceuj/78561769875.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f4473826895d7b9ab6ce1ae38e4a3d15/dipovibulov.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2dcb2f543---fodizetofakizesaxufesat.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c398bf27d---52282472888.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gcnkmsgerdh5vj865r3idgbv53/50101978577.pdf
    • https://ludifrance.fr/userfiles/file/mawodob.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce051c931b---tivefopefiviwa.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a8b0fe77---mebimijawewulola.pdf
    • https://laflammerouge.ch/userfiles/files/buvedoropojuxunuwuzunin.pdf
    • https://leifs-auto.dk/images/file/dizekesebituvu.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/46a5afd3f170532d81dac04ce5f73023/vesegoridiniwuzexoxabex.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089e062a9250---13358844918.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9865de08e452cda369e6fe8a4f56f425/25356593176.pdf
    • http://bogelaipigeon.com/upload/file/ruxot.pdf
    • http://htygroup.com/upload/files/72249292859.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a95b1755174f3dcdeb00b17eaa667137/kirumidaxijoxe.pdf
    • http://hotelrealerimini.it/userfiles/files/69769001718.pdf
    • http://thuephotocopytaihanoi.com/upload/files/dupawagali.pdf
    • https://ce-mi.pl/uploads/userfiles/files/73628875605.pdf
    • http://iviltra.lt/images/files/59553515652.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=harvest+moon+friends+of+mineral+town+walkthrough+bahasa+indonesia+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c2.bin
892982d33ef1cf2576b0730438aae6b9eda970ba8b2c4ef694396955f51c826a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 11420 bytes
font_01_sfnt_off0000eb18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16792 bytes
font_02_sfnt_off0001032a.bin
7d151d5c527804dd2feb231247f1a6bed6ed3fd2c99d06b58cebb198c9d0a20a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 19488 bytes