Malicious PDF — malware analysis report

Static analysis result for SHA-256 8632d0f966843500…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 14:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c672ebe4a0c2d2345d3cb27c3b121b80 SHA-1: b53fcb7546e646b1340a6417250db3da4fb09254 SHA-256: 8632d0f966843500d188c726a8e2cc693a16fa030e4140197fcea73fca5c14c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vetportonaccio.it/userfiles/files/musifeneremotusenike.pdf In PDF document text
    • http://phpirateboosters.com/clients/867602/File/37093950942.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c39817dde---wovakodabovipoxivodu.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/61946823828.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/45779222997.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/7767528021.pdfIn PDF document text
    • http://shamayachts.com/upload/file/tupesiloxox.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wupejinaweratolog.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d309961106a---lopiz.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/gerebivumozobakuvo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xugivoledoguxulono.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/nixarevuxego.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/91091060941.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612179f8aed4b---19300863121.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/72097895220.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/15791991536.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zejidabavekaveso.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c15541a1bc57b2a5f8fb4c69ff6df929/nituwubulakupabewiwimez.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/zatapajokalubevo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e1ffef8efd3137ab11b266fcaf6b51bf/surupimegus.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/74601808304.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c6a0abf30---pidifukaxisebevogofigadaf.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091c25d86b48---52873732983.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27754977ee---susixeximunijalix.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fa25981a1ab4ce4ddb4768798f87e054/51641010876.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cfed550bd---67090621133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=text+morning+for+himPDF 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_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 10352 bytes
SHA-256: 84b076272f03fc1d37389540260ad9260d0e737e16ff3ee3ff778599832821ca
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 19652 bytes
SHA-256: 40b457d0275ef0562143cacd09f37baeb8ef437be954b8898fd36f0848458d58

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