Malicious PDF — malware analysis report

Static analysis result for SHA-256 15759815af8d56f9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 10:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2918fd0d73916dbc89b0d98657d2891b SHA-1: bd27cd6adf91df51cb15e988663f9b997574df49 SHA-256: 15759815af8d56f90827c8723756a245d548e9f452e6c5a57e88c86bdda60fa7
204 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering tactics to prompt the user to execute a command, likely to download and run a secondary payload. Embedded JavaScript streams and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://laborke.ru/uplcv?utm_term=galacticraft+space+station+requirements PDF link annotation
    • https://chptravel.ir/data/file/jipolowukexejanotodemure.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3rqt2sdhugp9bret9hpt0rkt6n/livajemuvi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b6856764---nimemut.pdfIn PDF document text
    • http://watch62.ru/files/files/42693467249.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23501e79d---duginaguteke.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/puqmn0eni520vtkrmqft0hh24h/90202340199.pdfIn PDF document text
    • https://filetorme.com/upload/files/4812508694.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d4c21985---sijijowisinefaduvaxaxe.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/xefujiwu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5e56e0af2---99042525282.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/8239161412.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/32135646304.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///sebuzolujujuki.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/64885146004.pdfIn PDF document text
    • http://oris-am.com/editor_up/nuxopapawitutolaruvo.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/malujilepukafopudugin.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b7a3d341f3cf0de84bf729e570a9d26e/92741844473.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/75289189995.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d5c0d33---vimasubamojubifoz.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/s12pot90b887a6kq6dgelk4ipi/22994106731.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sumuxedefuxekujugirixaf.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16277359384975.pdfIn PDF document text
    • http://abwessex.com/uploads/files/11666063902.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/rbf3bt6vfmk86f5qduojasl1fj/juwojixixamuxezodub.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 18572 bytes
SHA-256: b0fffaac082f3964fc34e86e09c7d31377c08a4798bf3a813cb90ac49684ea34
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 10928 bytes
SHA-256: 4d4b39cb677b059a527f3cabe41368a31fc7a6bfe11db4972f9e11c25da2813a

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