Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f018f375c9af74…

MALICIOUS

PDF

86.5 KB Created: 2021-07-20 12:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 31a528c9bd9ed0ba692ed5c73d97a8e5 SHA-1: 1a0a207280942b306c822acdeafa845ff12f5f28 SHA-256: e9f018f375c9af74fb523009fcabadf8687c78c8f9eae136adefe097592a23ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://groupkaishan.com/d/files/62105942585.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f81ca433d8---32866625889.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/18026691211.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/bitivigek.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/5716261940.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/lekaredeladeji.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/84387887.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/69c82864d4876874dafd14efbb986da1/72273845985.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/lovevufixarowojerujele.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/tadeloxejebifekilovive.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ede5f95ac6c39a0ec40f0015da34240c/jilakixanizifeve.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/82380233422.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/88ce3b4c40d282282e3bdd01806908c4/nuzadajinujotadineri.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/70245759015.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210619022715833432hddugy.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b8b4c02b784cc42237920f56213c046/sopatudoxoxebo.pdfIn PDF document text
    • http://imbirimbir.ru/files/palipetawetuzefujinege.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/81110877997.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/nakuvuxijekaranojujelobap.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/34614919688.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/aalrjom5ij211j55qomc2gp2mb/sowidowo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160abb801d48a9---furuboxuxig.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/debaxabujetirisosa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05b278a26676c4eb3f0e5131682921ee/tometi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfb6294f2---86986553692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chapter+10+summary+things+fall+apartPDF 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_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16912 bytes
SHA-256: cb230fa94b4af9fe24b55f6b228b194aba7e0461161f753d7b870e994aa0a95f
font_01_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 11104 bytes
SHA-256: 01add6eeef37db8716181505228859582062350dbbff6947e1c8587ca8b1c209

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