Malicious PDF — malware analysis report

Static analysis result for SHA-256 4480426f2961b14b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 19:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ded12d9040db50edcbee177193a46bab SHA-1: dab22105f619e613fbf63ba3c2956bae0ea32e33 SHA-256: 4480426f2961b14bed61679fcbe84bce3c34d8dfe2a41c73be28a441d52b41ef
244 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites. The heuristics indicate a social engineering attack (ClickFix) and a password-protected archive lure, suggesting the document is designed to trick the user into downloading and executing a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://darkoyunpin.com/calisma2/files/uploads/89197942218.pdf In PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/majisexufotub.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4f2ca2ea96a88d2c8b6d968dba2daaff/20435084368.pdfIn PDF document text
    • http://edituj.cz/res/file/548710974.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/zifavato.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/67071743181.pdfIn PDF document text
    • http://vaynhe.com/upload/files/koxakuguju.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc252c06c---dotofudilawur.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/39899759468.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kexisimer.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/funodemadolalamuro.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gexisukijenodorasazuxiga.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b11c36340f0049be16851964a5c7752b/livet.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/givelisoboxamifepirisines.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bab861422---soxagitopura.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/65673912404.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kipimevofuxewigiv.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/pogejipobuz.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/lidosige.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/97718008504.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/lunusewujudulavadalufogo.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/17407247904.pdfIn PDF document text
    • https://deepex.hu/hirek/files/31247904496.pdfIn PDF document text
    • http://platcometals.com/images/file/gevokoj.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-17/20210917092315106697.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/7460346112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+disable+safe+mode+on+your+phonePDF 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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 11192 bytes
SHA-256: 56ec2051301272fc836148be1320e072245a9788e27ba07d129ee8ac5c0101ec
font_02_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 17572 bytes
SHA-256: 1bdc9f96cd17d791497c97de5e86b165f45249737c0db01a6cffe757cdaa7b4c

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