Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae878fc7ba3f3e0…

MALICIOUS

PDF

75.9 KB Created: 2021-08-17 09:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a182b0c3fdb3197b10442562d20a2c68 SHA-1: f57540aa7003ac72406ea6e194ef1d7fc7e88ca7 SHA-256: 5ae878fc7ba3f3e09245f9e8a9a4458b247a39e9964d2faa5153ba3845bf4bb2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised sites suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lumieretvie.com/userfiles/file/50077998336.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/62970915802.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1nfe0102pm3mvh8stqc2doneg5/dutoripageremawuluj.pdf
    • http://boxethai38.com/upload/file/wokedix.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c41ec5570---gopexetediwivubopemod.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5b7e2d34d75dfa860ce84c2fc95eaa5/12196759942.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2a12025ae75daa1657af3f6c23b7766d/togomerowilunivijuvanil.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d216dee5---savupes.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fea7d47e4---91765594584.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609e236ca775d---kurelumowojafugule.pdf
    • http://wooshin.kr/uploaded/file/4715796360e36b49bace1.pdf
    • http://smepil.com/ckeditor/userfiles/files/sexupamazuxijokifarowa.pdf
    • http://tlproduct.com/userfiles/file/dixuluzolufuxexudas.pdf
    • http://klinikoral.com/img/userfiles/files/79665130067.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d93abf53a44c761fef4028907ab91a02/14693219174.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/568fe965432474242390edd3d588d16a/rufifulomufu.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bc5683bcf3274f412b7c92a58c99e433/jatudusojudifez.pdf
    • http://maroba-zirndorf.de/file/kazikejopobefutego.pdf
    • https://shunnasato.com/mafazotejerizofata.pdf
    • https://99shayari.in/userfiles/files/kafevizajakiwivegan.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sls8g79ilj51m8so7br6i8f0h5/29581871021.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ab487251---96972906171.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f43a92508a6cb1f33d96a531c2e9bd76/xukolivil.pdf
    • http://sbox-technology.com/upload/datoteke/zaverebosana.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bonavita+peyton+crib+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c577.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 16792 bytes
font_01_sfnt_off0000dd8e.bin
ee1e96fad484b1d8bd01c6dbbd8df55518e73c7bcd8d702360d5f4fc66a38be5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 10792 bytes
font_02_sfnt_off0000f66d.bin
db545dcf1fa5835653ddab61ff761eb57c6e860894f9e77b05dd801c85c02d66
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16200 bytes