Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8f4d6651edfde…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 22:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38b71cf3e34988621b30f5ea1451d47c SHA-1: 682404203d13fc3f68e155c67d52caf508120fb4 SHA-256: 13f8f4d6651edfdefc5e19a8b5e3ca6fa2699d0bad824a081a693ca3524ed107
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=today+tv+shows+list+tamil PDF link annotation
    • https://senfina.top/uploads/files/36077605052.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/10753266209.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/61554216394.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/42840418244.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///limipelivorofijulewopop.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/20267746903.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/nifumawudinigit.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pisadokaliduzabejo.pdfIn PDF document text
    • https://luminex.pl/upload/file/lixuwovifiwetaw.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/rinot.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h9c9vt7ps0r3b82n54qt45vfe9/46693130111.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/27950545513.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/takutemaxuzasinerekaxilux.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bde13ad73d---99772260295.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e11920d0849dfd1ea1839ed61a6b3bef/gamewabobusinusem.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wixubiginozaguzomaborojo.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/90450452231.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bqei93lcn6qbc2ule2bm7kmeb2/xirex.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/gawomiw.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/semakuzasusakivovifoka.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/5921990701.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/juxipik.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/dawuwolinewukezokatawojit.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/toribumedaneril.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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 18120 bytes
SHA-256: f8135e1f9f08df476001cdae333bd555aa2cbeaf098a054b277f9bf8434c2fca
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 10404 bytes
SHA-256: a192f16cd727c193d52dcb3351cd5c0d517769420c1e3933c9bf9b77b7c1b807
font_02_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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