Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8edd7a7dd53982…

MALICIOUS

PDF

92.6 KB Created: 2021-07-08 22:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05cf92e6124f0639d5e5b19591e24900 SHA-1: 853e21e3325d21f3a1dd263183ed562e4f861e87 SHA-256: be8edd7a7dd539828b5261acf2a31031060e39a85ef895e1933680d3c3463387
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. The heuristics indicate that the PDF is acting as a link farm, with many links pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://synerhu.ru/uplcv?utm_term=white+winged+woodpecker PDF link annotation
    • https://pharma-tools.eu/galeria/file/zawamekomexugufirejimo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/pipubaruzanexupigapal.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e315c1221f34182c5f27796a248f95ce/90519333143.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/74956479589.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b963e999---66048712202.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609944a1f3676---morokulazokizun.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/bopowudetobekogi.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/65476797572.pdfIn PDF document text
    • http://dentherapia.hu/files/file/3906823101.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2abafeeb84c3816916380416382649f6/22873635622.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c25abab7---xijixukitolejawuvenezujok.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/10961027919.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/21502713589.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9c716e0922a579bfec21ed71e738e321/10123515531.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vowejusewidib.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607006be712af---rekuxeramesugugip.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/suseduwologunelafibexanuv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1af5f04d---92979891134.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25f599093---gerabuwikoxolud.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/62957871322.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cde75ac44b8bd7fb1f89163def5762b8/novolu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3cf160b9a33f1be66a1f063d32708000/96771777970.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/51e5aa06fb1a5fb27f4c498a61ddeb41/70586413839.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ucdj0cvi7uj13sqflq1fqef6bi/xipivirepuzen.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_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 16684 bytes
SHA-256: 32b7dbdf524a0d538e799c1d8fbfa00939e433b62bbfee33448d888be850dddb
font_02_sfnt_off00014d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D25 10588 bytes
SHA-256: 4b10c9852fe59185331a1d290ab5444b7adacaab60e75d8da4d4edcd68dc94c2

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