Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33dd8bdd155352b…

MALICIOUS

PDF

94.7 KB Created: 2021-08-20 10:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72900cb88930f74f26c1e2db59ecdbc8 SHA-1: 10ad4ccf76ef0ebd5ea487dfb5c1cf4761115caa SHA-256: b33dd8bdd155352b00f1d2b7cd2dfe6e81788682dd1b4d188930da2fc07e17a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and link farm nature align with techniques used to distribute malicious payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aftaplan.com/works/peepsparty/html/upload_files/file/86680727942.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ca33836f31f8480096bec1add551e1ca/11307747928.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b5a605c5---gitujevenoxusokudewixiku.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/dedexobumofasaxu.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/gawujobewej.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/wajejoki.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/jujodixonovenajasigej.pdfIn PDF document text
    • http://babamoleskine.com/files/file/rugezekepuxanopufaj.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075970789cca---xibimukozuvebonudokumov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26772f002---tazigi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/88232835583.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1cb028bc8546d0daf1526c58c7208917/sopinafunowiko.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb7ef1a00---33423170047.pdfIn PDF document text
    • http://newo.ru/files/files/23363537762.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/bebewozujilap.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/97765977457.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/58442352644.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/65309640073.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rr55ksoaqg5ulir13p3o5lk637/zivazalebelel.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a7a0607f---20553156765.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a96c9bf49---82037560111.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/8429252902.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/kenibetujufogezadepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=perks+of+being+a+wallflower+summary+part+1PDF 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_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 11288 bytes
SHA-256: eba1c7fcae71ce85351229ec742ae481c1951ca7255539a26bc012573937d4ad
font_01_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E64 17836 bytes
SHA-256: f38cc9dbf1650e283b85f8afd9d6070ba3ec8bf45c97698268b091493faeaead

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