Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aad0778692fbbc…

MALICIOUS

PDF

88.4 KB Created: 2021-08-03 06:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ef8399cc2f356f63c65db55fc27fed5 SHA-1: 23eed28d193a16d33c8f03850d5c8b71f6a81980 SHA-256: 28aad0778692fbbc7c57a3338c08cca0f980d366927998f6ba7644adb8d80b66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to websites hosted on compromised CMS platforms, likely to lure users into downloading further malware or divulging sensitive information. The presence of multiple links to compromised WordPress upload directories indicates a pattern of using vulnerable sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a48bb78f7---doluwojojisenax.pdf In PDF document text
    • http://thietbixanh.net/uploads/files/demivefudepawonureza.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/gukofadenov.pdfIn PDF document text
    • http://pronobile.de/catalog/file/67550527068.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f346a58b4b7---96847556953.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/dumusuwo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac31fd4c5c---kagovovogaliv.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f98q6pd5gssl70eoj28uru9kb4/85653803422.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/savunigaj.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b1f8a9cbff04acd3ee7bf9fccba67d25/bebimunoximixajojuwikip.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/xuregifowidojexiparuwu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/xoxer.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/monivajevusuza.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c582dd0c149---60522328193.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/74212896670.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/3ddd5e5086f9bf6406b2662f4c0e8caf/tigezipukivu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad28ac7df5---nilofobusumuve.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/14081907418.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a812b291fb---17529651909.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/nuxuratewudovetekamijado.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/rujopejina.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c0kkqss9iqehgla2rfb491nhp6/momop.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/68051544744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jelly+bean+slangPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f518e0b0fe7b744c5b2b66937eb675fd/luxusosukifexa.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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 17620 bytes
SHA-256: b1ab2042501cb7a67c57106c4945f312312abaafc5d0a6534587b1e8da8d4e91
font_01_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 10116 bytes
SHA-256: 5f45943616bb1dd0daff0a3686f72e8861cb1199ed130560a4bbf060ed006c7b