Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d306673fe0c024…

MALICIOUS

PDF

77.0 KB Created: 2021-08-29 17:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddc823a5f9f06a2e80dff3dbcd222c15 SHA-1: 03665cb4ba01c94255cbfa37b6148dfbda49a318 SHA-256: d6d306673fe0c024f1e9f6fe1cc3fd24356ea4dc90f2fbee79f384082d1b4f9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=organisational+culture+examples PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a159a938---rixododubita.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7452a84a35ac9dd6dfa438c2d939e4eb/57790710207.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/14460760787.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/givufifedaxomamope.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/metumona.pdfIn PDF document text
    • https://goldenapp.net/file/27658844612.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/jelulixogasiwafogab.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fabe0bfb352cb9c78d8cd5b7951d07a5/44105912117.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a870a4d28b5---zolakekumozosetom.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/7742792169.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612729a36e6ea---sulagokakulubipevaporeb.pdfIn PDF document text
    • https://0900107678.com/upload/file/75828203816.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a6f161a---gimutami.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gujaxibowagimola.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/jenumutafaxu.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/66862111581.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/jasekepaxozu.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/79405098565.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/motifonosuviwudegagako.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/savitidagefo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daced17c9e5---xitukifeb.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76f4b230c---61217825554.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ee59452c0---13783305322.pdfIn PDF document text
    • http://altinay-law.com/images/file/48325937299.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2958b129bff528b268499a37c6c344c0/xavimagogopun.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_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16920 bytes
SHA-256: e2c6cc98ea346c7948ec8e801d7a0b9eaf17317ae6818cba95195a0a782cd79d
font_02_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10944 bytes
SHA-256: 0d13b948a44bebd808611f376a782f2209d90da78471cdf82472ec8ba3649191

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