Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a3aaa310f2a5e6…

MALICIOUS

PDF

126.7 KB Created: 2021-07-06 01:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9e7af46f1bf4ebb001cb711ac4d05b37 SHA-1: a1977cf2348d05ac5a51dd74ed2d8e3007b2a1ba SHA-256: 28a3aaa310f2a5e64050291896e84ead1d383d1c31856d1d6df121bfdb043414
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/64892dcae737c801c8794cdc7ec348ff/miseparakinutujuzotoxol.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3380e8ae4c---wizolobukemojugipevana.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/nobededipefamugowapudo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/kepuw.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/46783228384.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8f0fc4213d329ddee64b0b1f609e43b8/lozelizitudumamab.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/87258490171.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5aba85f3---dulaluziw.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/51909331991.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf35b3ad3---29688248603.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f26324d2c---raborepareduwinemides.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae3be7e2a2e33717f2419e840c7819e7/xinalubaleze.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sexitetalalifiduxaden.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/268f60e13d423f7ab3cf1e98b5a6944f/fuvotakofepupevofadikebix.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb91bc0b14---63372568679.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074168ad07---22894468234.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/47fa359923b41518972323504ffd8250/95095119711.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/ruwipew.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/nugijabozizuzizexovisi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed776c39d---vetufokotizudide.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/65f72475abdbba27ca59c42b041dc01c/dalusefevusirulujarede.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608904fc82e3d---44584585908.pdfIn PDF document text
    • http://scro.ru/pic/file/75244953677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=we+are+worried+about+youPDF 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_off00018b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B43 18696 bytes
SHA-256: 441ac4caf07514ba2722751d0d39453c256b9eb7698f2bb49c37c843da258cf0
font_01_sfnt_off0001bc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC87 10356 bytes
SHA-256: 8c2ab8301fd7a230b7f545fde917aa231870a772f2a8f153bebeb067b71e9b86
font_02_sfnt_off0001d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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