Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fc6bf73315e392…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 21:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 154cc64b05882fd19da6303daafebd2d SHA-1: 65545d82242a42a3fb1b6ed93dc2daae657545c7 SHA-256: 52fc6bf73315e392913fe206675b52c7b083bf80794e40e188ff7caa189e4b20
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43a1aa311---6420466908.pdf
    • http://alituncer.com/userfiles/file/genol.pdf
    • http://aircond.md/upload_fck/file/pavusodofakokirofozipa.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a80f2c6d7---zojeduguwilotidokofo.pdf
    • https://fenixfalt.com/userfiles/file/bogazebiwunoxupi.pdf
    • http://thaide.org/userfiles/file/8059292526.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960cf33b760---7024012359.pdf
    • http://rustproofingottawa.com/userfiles/file/vituxapufizubidogut.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f31a4cb8---65619918460.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb28c6a0a1---30770825175.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096624d124d6---3880705430.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b20441f421b---nefotasozipovuboku.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a056513193---rizevenololedibojolak.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089131fa81b5---19229257738.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/53a83e28f56732d2c992876af86f75ea/jufagosesuwavasu.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c57ac919---36165655050.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4371f375f5a9249b5b23b1842337f774/fobefiwegewikologojate.pdf
    • http://sun-tes.ru/files/file/dakojuva.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094e15ef3e50---murotuvopowakatep.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210607141521.pdf
    • http://morgancountyoh.com/userimages/sogodulopazetolapaxa.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/814a7518342611c90db9bf1be607e12f/4077777805.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d674ba8ecc---dipugamibitos.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074103496922---64660083606.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sc4av5mi9hrgphdoa5qllo1no4/resifepazedivijagotit.pdf
    • http://guides2alpes.fr/uploads/file/66508318203.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f65936d87f93c8f6ec66109c7a255a78/momawuza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hairy+field+spider+south+africa
    • 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_off0000fcdb.bin
5d1459edd7c3a05e7b3aefc1a1a393f101d0b74e071734abdb732fc44e9ac67d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10820 bytes
font_01_sfnt_off000115ed.bin
3f68a8252fb0db4a04da0cea301ccf03e123c6c64a3b79fa8cdbe5c5fcf71ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 17196 bytes
font_02_sfnt_off0001431c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1431C 16792 bytes

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