Malicious PDF — malware analysis report

Static analysis result for SHA-256 795fce28633a857d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-18 02:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 598480b2029e71a2aeaff3db85afa348 SHA-1: f3a192244acb6033f0b0a92666862727f6d6ba8b SHA-256: 795fce28633a857d90ec794fe85915903f97137a52d64dacddd6fe6122600d90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2ec1db9ae84ec6c91703244d411c89f8/fonepinavov.pdf In PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/27c503243c05b13839396bf51a7b8676/gudesa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97bbc71b44---42470524573.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/majozuwezemedezevezeluk.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5ecaadad4ba426e89d50d4540b07217/28522301466.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/98f48e084p5vljsi1ts02eijo9/95849053431.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/34821394953.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/zerub.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ffcd2d7dd87ed3caecd4ece2e6d2d750/23441295503.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7604b9b9a---kokadupipubejuxomurog.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rusinetudigovodiru.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s4p701s5jsfs73veee9dvgiea5/bapujabab.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/ribinipi.pdfIn PDF document text
    • https://efnnma.org/files/file/terifedagixatez.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/60608477056.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c73674fe---jotefezurutidisafilufaja.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b6ec77491---rigaferusirulivinasuxutus.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093079b62b53---digafugozotonolojo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2nl4gr9u3b9t980n512tm1t3sv/29129300331.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/87126591942.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/4828236728.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092521c7f268---tifoladojuwerexesusilelik.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c30910069b0---66119472965.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd60a6d54---zofunexatezukuzunikowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sick+of+you+meaningPDF link annotation
    • 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_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 16620 bytes
SHA-256: 60152cc9826ed6dac2f5bcecff8e624fd6aa7a259592dbb60e3d6d823e24f9bd
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 10648 bytes
SHA-256: 0cc0cd78e41f8a43e5fec47c20dd2475da417b5653c7a1ffe5a09c2a39c7f8c6
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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