Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5b7734146e81fe…

MALICIOUS

PDF

107.1 KB Created: 2021-07-08 05:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48afb0809f344a519bd8ddbb670bc9ac SHA-1: bc4386ed1e37c3ca557099f2e3c3b91c8e6fa8db SHA-256: ee5b7734146e81fed75f6f8a71938fa6716776c463c6f2063ac8bcf1bf67e47d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=road+right+of+way+meaning PDF link annotation
    • http://kuhomania.ru/ckfinder/userfiles/files/jatemuvubewoz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a559fb133d7---63876175148.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0185d091f437d30e9cf224d0e637f855/dagekiligajowo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dbd3962a9f18b1b3ca4ea23dafbdb3b1/23119275337.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac7015300---36848893425.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/jijaluwomidevotoxulov.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e2260b19---27923392774.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/8056341174.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/xugososakanaxu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b4d74124---78769507513.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b12131dcd---24365369948.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2af6e3ea9b857c601204a6d9414c15b2/futaf.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/75290637073.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/549808b9417e1c7479eb80b5761d46be/metenevimebivubujokowo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/02/file/20210702_035501_179.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vepaxuvajorule.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/ramasojafetozeborinakelu.pdfIn PDF document text
    • https://orrizon.ru/images/file/sisiluvuko.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a7d5440e---gaxuj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/90ff8f7d3574199247f5d724caabcd29/taxuwu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d0e1b9ea---fotud.pdfIn PDF document text
    • http://abpaluso.com/upload/file/furaxi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/49f05bb432ebba25ec13b2f05683fb23/ribesod.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_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001581e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581E 10832 bytes
SHA-256: 1fbdaa1361a18869e22925374cf18cffa8f68a8f0c68effcbb2353c72cc6e752
font_02_sfnt_off000170c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C4 17800 bytes
SHA-256: 9d00309d773219fc0ac4d77230ece5daab27836e72ff4904b8d5f5e32bf97e0b

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