Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a51f4e8cdc72c29…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 13:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28543f6530f8e03619aca70e3d835404 SHA-1: e33656f01d013e07a820156be8d4e7d0528d0abd SHA-256: 0a51f4e8cdc72c29b0c4d221adb408ee7c6bea0e9c6e9dffedb33a972162dab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vektorma.ru/uploads/assets/file/24954308006.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/vigiledid.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/66706778870.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/91908554338.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/tekimigukukisaxenamobasin.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4503e8c380bfab56dd0ff99adaca79ae/15252101573.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/limojud.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jv4q91b2tttacoer11cgppbtb5/xunofexaw.pdfIn PDF document text
    • https://rotitelor.com/contents/files/82093570293.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/47691408188.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xokurob.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/boluku.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/liralimu.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_044708_127.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/bopolew.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/gixukabepi.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fodifewidiv.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/witupixonemum.pdfIn PDF document text
    • http://chipgene.com/image/files/20210907_190339.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0d53a1b5---bapusinikuwunidileg.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202199203633404.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/kukabizexafejezufado.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/8554311346.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wokeponobi.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/sodupurizobagavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fear+the+walking+dead+live+streamPDF 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 17512 bytes
SHA-256: 3f70c3d1d18b99d136a1d8b8a42399955fcacea4ca2f5d2ef34fb5517c1960a5
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10796 bytes
SHA-256: 32a495d1b158f1429e44942b76b1bd151a0c60330579013df33b0818982abf58
font_02_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1