Malicious PDF — malware analysis report

Static analysis result for SHA-256 422857057582ce02…

MALICIOUS

PDF

90.0 KB Created: 2021-09-18 13:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc6805ca3035aff7dad5440020bea70b SHA-1: 486e691e9cb06372a7f6d5ee52e639769f9a7fb4 SHA-256: 422857057582ce02e03b7346a76fa6bf0d99b714b0ff55a83acf299ca3d3284d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external resources, many hosted on compromised WordPress sites. The presence of JavaScript and the link farm structure strongly suggest an attempt to redirect users to malicious sites or download further payloads, aligning with phishing or malware distribution tactics. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=skype+%D0%B4%D0%BB%D1%8F+android+tv PDF link annotation
    • http://dgjst.com/upfile/file/kadufilozoxerugivefipami.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/koresojulofikaxoxen.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kuwewizugemazuzo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa9a7bd8c---47589226301.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f985f7e863---87711259686.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/xosegajanipaputewa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0c56d04e---48169927431.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a105df03e2---lafodemo.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/konavunutubadumigazutezet.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/torexajalatopejadevagax.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16145551b4d8e5---39065485049.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/gedisasazud.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/88937001435.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/8311734963.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mevedutazikegepi.pdfIn PDF document text
    • http://corkpotters.com/images/mikonebidokut.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/36486601427.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/e08ddf.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lakutanitamunoj.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5b3082a1---nituwaxubeputubovufi.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/63130281986.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/safosemetogekodegem.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 10856 bytes
SHA-256: ec3e4a3ee114efe183b8687d1057a2180e23e46159ecde7365446e048b90ac70
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 23720 bytes
SHA-256: f7309ad31a0836d106720c095598d37bc444833e497f01dc4f9cfb7d1173a1fa

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