Malicious PDF — malware analysis report

Static analysis result for SHA-256 616babe8f8fc195d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 07:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18e60ccc906693c03adee5d15d2c1007 SHA-1: 9ca26103126442db6b2e15c4d7f90de205bc5d4d SHA-256: 616babe8f8fc195dd29d1896979190a5972cc6d80aaab97a3f4fa95dc2ccf6be
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown domains, some hosted on disposable infrastructure. This suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0f7247cbaf24df16af2f4893729256b7/niwupu.pdf In PDF document text
    • https://clearpatth.com/userfiles/file/zuguxikufunuba.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe297788ab---61338645801.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2mgmraqot6s00cee2e4f9hrj47/gilijewevomobonipuw.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/9912557700.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/rakumuxed.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef97a9f1af---deniwofabubijaremalosuva.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jovoxubijofibise.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/kuwebiwaxopoxelizubetanek.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/77a958d50209c0510e43d2214eeb217e/76874921679.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/ganegotasuxufafa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed6b8a4fc---dugopuxuwekubituzalub.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/tibufutazikataxona.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/61906724659.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/24691981080.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/bomepirotibolinizurofegi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea34bc3ac---fezuvotatibezozatulet.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4719bec7b4---43073233832.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ccv6rjevoq71j7tbth36nf5bao/mimimelizubimofopume.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bef8b662---72335085685.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/10b4fdc478e5f41b34f24bca85242371/zogagobozukejumemase.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4539bf2c20---65662519648.pdfIn PDF document text
    • https://aedwea.com/upload/foto/78377645911.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/86402d11c3b857e9d428319c54d990cb/tafegezajawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=glidermatic+grd+service+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_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 10796 bytes
SHA-256: 1ef2b09632f8d33bd50f3388d907d1ee01acc2488170f9d8b9de255352bcf56f
font_01_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 17588 bytes
SHA-256: 1229f22cb683fd0152b1eeb50ac642a19c6541027842162e74cecafdc5b249fe

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