Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfa612e1c44bf41…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 20:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a9bd1dfa501f00c8b2f3fcae6ef1902 SHA-1: 1272207ee54025094fab92b3eb41e531559a5030 SHA-256: 7dfa612e1c44bf4149f32d3f045c89202c843141527f225ebe34efc248223240
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=percentile+meaning+in+kannada
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mer2ku62krpocluhfqk6psh984/kegoregulesozimet.pdf
    • http://szentistvanpatika.hu/upload/file/xemisuki.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160726794ab10c---48604131758.pdf
    • http://www.victoriousintl.com/new/resource/files/guzadediwa.pdf
    • https://harrisitalia.it/uploads/file/15511761326.pdf
    • https://areicon.com/images/file/14672412468.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b97c56bd---zotudakabomoko.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160896dc416b12---xibatenurolori.pdf
    • http://www.hangmandigital.com/files/file/kufokexaluripu.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b553be2da69---zifuvabefijebasulatijoz.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc30a8990ab---jiwesaremede.pdf
    • http://www.odnpoznan.pl/fotki/file/file/51130510128.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7dbeb2fd0---mexepavivenazanuna.pdf
    • http://parkhigh65.com/clients/4970/File/xajupavewake.pdf
    • http://nacyc.jp/Upload/file/netuva.pdf
    • http://hakkabrothers.com/userfiles/file///sawaziweviti.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd676ac050---83851492111.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af9cb3a8cbaa3a3d947f8331c63ecc25/83640503098.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/61578b2604b9e8281dfdfc9fff3c0342/tokedepijuvo.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b26885d33495ab5bc055af01dd6b5830/gedajeverejutaba.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5395b577---sugegizifitenim.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d296d514b3e1d36dc55a8856e82e0a4b/rudadexilelozufijivuwasip.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/73056926296.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/17cf7fa156391349f7f0d80c334e9602/36284576944.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fc3cf87b46d821e4f0f483e8298116e6/luwalegowux.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cd464ba7c4b96928fb16efff282e7181/83998871949.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_off0000e78d.bin
36d17ef4c8e7910ffd2d67ff26d8c70c291d4a376dbc3bf03cb06d3143f4dbf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 10516 bytes
font_01_sfnt_off0000ff34.bin
4d626ecd38a0834f0b7beca7a06ec48e5ccdbf8f9d3e202b303bd94140ec9e40
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 19140 bytes
font_02_sfnt_off0001313f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 16792 bytes