Malicious PDF — malware analysis report

Static analysis result for SHA-256 add6519da8dcd5da…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 06:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f44e34793bc487b340aeed5d95bfc4c SHA-1: ba373714b2285983f50863a70db5c5c556a0f47d SHA-256: add6519da8dcd5da09b54a819c7d277074a9cdad8bab3bed1adc7febabc4adf4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=tricky+android+game PDF link annotation
    • http://autoscuolepintozzi.it/userfiles/files/62296068051.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/keridulinokup.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/hjmceo6cca98nh9nk5nr9ulkf6/lixadoxazarejojozelufomup.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/50076270130.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/54750619532.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/66036611417.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7c2131ef5fa463d0b22281b707397235/45744898692.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219141115573834.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bcc26e9bd---51629350491.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143512285424---52780033391.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/56904447167.pdfIn PDF document text
    • http://wawa757.com/uploads/files/93059838536.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/vigatoneludupugifikileviv.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916122436740351gw87f2.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/sabuboza.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161399b746078e---89510680607.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fokagilajisugufes.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/xutozomafiweriwa.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/kufekulap.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/33541507523.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/94658283292.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/23815495449.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/mifona.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/34853289644.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/81805754720.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/89038320944.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/19972252851.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16192 bytes
SHA-256: 899c2bec4cd46d8a536c82a0b2d033e50479e18bbd48ce3aa894ab9e7c746910
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10568 bytes
SHA-256: a6fa66e96326688946925bb1e88743228b5e0a48894b350fb5b5ccaa4125d3ed
font_02_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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