Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae1d82f071422c7…

MALICIOUS

PDF

101.1 KB Created: 2021-07-23 15:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 906795aef3f25dbe30bf810d4ba842af SHA-1: b0b5f47c18d2bf17a94e559ca7559b535c7016e4 SHA-256: 8ae1d82f071422c7df2544356fb43303b5062a8b3a7ac2a50bc974157f4f0b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The document contains a link farm pointing to compromised CMS upload storage, suggesting it is designed to host and distribute malicious files. The presence of numerous URLs hosted on various domains, many of which are associated with compromised WordPress installations, further supports the attack pattern of distributing malware via seemingly legitimate but compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708abd59545---nixogaxexo.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608328c581660---54644511754.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/37912236362.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bebef91b78f58365a834696f0c32418b/godufivux.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/daf6b97da5d55574ff809f729484bd18/wegulisede.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/66234283223.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h383k20hcasbsfk2sgeoq1gm7r/rovijebokezoma.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/dunesarexo.pdfIn PDF document text
    • http://abnicum.ru/files/file/39407347507.pdfIn PDF document text
    • http://chinazzjx.com/d/files/39998853163.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/resasolilinurizasipime.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/depuwimizasumemogilif.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/31693400631.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c71262cbd55---kenipitejuvesatudoju.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a4d035bf3---vunexa.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/469a405852ea1996aa7d461eb96ba73d/26547905294.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/25512685788.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e40a29bd4---seguxikedafofuxisukibu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9152fbf541---35049547715.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61223c9a9---34960405351.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/lonigosixofoj.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/nijabuvubepapofo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e640a21ac61---vifurarisowubovusilomij.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zuxudekobufamomitowom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bio+data+form+pdf+for+job+applicationPDF 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_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 17272 bytes
SHA-256: 39ace0a994b70444270e305d421549a6a8c1bca2fd40bf8b5b52bb660f736784
font_01_sfnt_off000154bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD6 10804 bytes
SHA-256: ae9a730ab459ef511e7c8c5943ff48118f66c5348daf7cdf817afef75532d793