Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a58d228c9c2ccd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 11:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 077add4bbd506fa47f9b6d279507a915 SHA-1: 2af0e4037645fa9f220a838139847a74ddf84b65 SHA-256: 97a58d228c9c2ccd6ef2e628a114d698ab54d094685b06c612c3fb7d84bb2309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://alshamiltrading.com/alshamilfiles/file/nemafovimuworixikulidotan.pdf In PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/ziwuref.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/21748809706.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/46334273032.pdfIn PDF document text
    • http://dgkno.cn/upload/gifoxalajazerorurid.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/27652709866.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1a0jtjl5j2imckkkf7ii5773de/18672217076.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f8f01e66b2cd5f29e979ed99b2658461/46511787177.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f39c11e4---39922438308.pdfIn PDF document text
    • http://abnicum.ru/files/file/totojug.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/16771774780.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/96598446172.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/14v39fr267ft1tsp7rfdlo86g5/kesuwuladalobox.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812ee28c2d7---15295577631.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/defobamobalitadezazupoze.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872070efcf3---22015216774.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8ff6c435772e5c549e98e4bd50e7fd6b/sajav.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77596f2a1---6557208795.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/39485962606.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t5pld8bq8b1qbslhgsofog432o/romozivifov.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799dd614c5c---vubukixuniraragegozutila.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/24kgfa55uq5j86rsj3afem255c/vedelenu.pdfIn PDF document text
    • http://df-foundry.net/d/files/3769923790.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/nofajivekaraf.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ee66284499b9f42109d95743b08ebc8a/sixowega.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b10a5d18500cabe6a62f0d12e85bf920/25765021049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=image+to+pdf+download+onlinePDF 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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 17940 bytes
SHA-256: ab36ff448a939e647c5400ec52d3c43a81756dc4a2b71eacbe20f2b345512e87
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 10612 bytes
SHA-256: 89026948c5573e6d5ac242d94f8b50e7b6c456a1f6fdf36d92031b1ed8ded369