Malicious PDF — malware analysis report

Static analysis result for SHA-256 92153a6d05519fd8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 18:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 585d034236a15531b4c76acd5ab25b06 SHA-1: 26825d933806b403433b8cf925a7f9cebf2f033f SHA-256: 92153a6d05519fd858190cf503b45dbcee653fb72093b3bd23004e676fd279dc
156 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=kodi+channels+android+tv PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1e4ea3b8---kebomiwox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136665200e2f---dovitutefowobamugo.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pigavapidenizefaluti.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/5315345451.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/23558945708.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/56531975942.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/folulun.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://form4concrete.ru/pics/cont/file/guxudodefanilowoponoxuse.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-26/20210926223254218508.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/3164780822.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/68401f066e4af22e241a75771947be76/12143572304.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/25270534948.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914151442238608.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/midox.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/dikitafe.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e402d3b1e5---bururapuwobisad.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kogasopuladiropoxe.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/nabibefebibimoveziwo.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/mufixa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614165b77dc9b---bezexapozilipekaz.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///81092204328.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/mowunexa.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 10524 bytes
SHA-256: bf375c9b011e836d39aa4648fb1b3e176b4aa5de4cd4778d32f0bf9d058005f7
font_01_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 16148 bytes
SHA-256: 3b27bd837ef52a9fb12161884fb594864bbb6652d2a6bc42379adcdd01a899c9