Malicious PDF — malware analysis report

Static analysis result for SHA-256 df47eca2443ba968…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 13:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c0a7a0919370915a07f5babeabe2340 SHA-1: 1817e385cc4a3785964111662ac065c0dccefe74 SHA-256: df47eca2443ba968db554843e716b388f992131f3e486b173c48b6334b3bf461
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. These links likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://crysiq.ru/uplcv?utm_term=errores+innatos+del+metabolismo+de+proteinas+pdf PDF link annotation
    • http://novosib-sport.ru/ckfinder/userfiles/files/neretos.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cba34487993b8932c878ee783b24df9/44415353970.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ff18217b---palarowegovowukopidafixo.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/97158116749.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/xomepifapikubokowiwojo.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/xadikewufedesuwixivutu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ebf191d---55966710000.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113dfd282ef4---fegija.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/64749748803.pdfIn PDF document text
    • https://bnovum.hu/downloads/40038165383.pdfIn PDF document text
    • https://tch.lu/files/files/fitatujugedapelo.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/90087563691.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/38844098693.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/jezujuwotopanilamixojuki.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/lozufixepemi.pdfIn PDF document text
    • https://olterus.com/contents//files/mepalitujo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/93812188650.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/80108074217.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5be4009e4f07fc0db41eea12ca11b4cf/kojawamifevuxibozalepuro.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/47633545970.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e3jsrkq0rp7g1imnvkkd27j1pp/zidapojizelefi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fepudivadotigel.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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 18420 bytes
SHA-256: 0dbc0301ce5748489a21a91ee3611dd41b18143a76bc139865985fabc256fd50
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10780 bytes
SHA-256: d9a2070e03a59d44dcde20aba35c4d12dcb88d01a29699b19a4b0fc02a9d8e80
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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