Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddfe0c253d67128…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 14:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79449696dbb05cab20e96dc345e72251 SHA-1: d93f6e49f71cb60919b4aa245f6b9ea2014b4e48 SHA-256: cddfe0c253d6712890567cc964f4cc986ee2bff0ed98f235a4b30a4604a2ca05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. This structure is characteristic of phishing or malware distribution campaigns, aiming to lure users to malicious sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://www.alex-vasilkov.ru/images/wisdom/file/82614882433.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132af323d2e1---lejalegugenonib.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b00d3e773---vijilelikamida.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cef15f150f2---ragusawiporoxoref.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/08sinbviioq85cmuesfgrcblqp/32474632029.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/86adaf61e275161e57d2d524f08bedd5/vezadowagitewatakizafuk.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/37942486686.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/89444582228.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/45337855002.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/98250942293.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b1690359---sofelitotuwupekogizuma.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a66fc106f9b5b6a1b3d800e22ec79b2f/dajawamasojugijis.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qt53u6o4hnkt1avajvoofuhrej/55695375324.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/aldiug3sf3ered4var1tad75j1/23134073491.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/simegonosokagefarevuvo.pdfIn PDF document text
    • http://blatt-gruen.ch/files/47203966135.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8afbdccebfdaf8bcd6edd7363461bf67/43592061753.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/wotexedunozisezogadizagew.pdfIn PDF document text
    • https://akconta.com/uploads/files/fegekinifo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e0871f8ee380a458e18e1a61ec990c46/76956381240.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/87880003408.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/464e45023502e92015dc66135c8e978c/81589654122.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/80551685778.pdfIn PDF document text
    • http://stefani.cz/fck/file/47075555633.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160fea4197a76b---28544545084.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/98015287401.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/wimetirov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ariens+st724+snowblower+manualPDF 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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10824 bytes
SHA-256: 2d314d61e8ef3a757052da5d1b8fa3ebd0e1bada2d2cf7985c58b218d96b666d
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 17972 bytes
SHA-256: be3139fd9184f141b8815b2c359e174e689afd21b77e96f04215d7e9f0c2247f
font_02_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1