Malicious PDF — malware analysis report

Static analysis result for SHA-256 578b0623465131fa…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 02:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 540b3c09a7797f7a893e84c47697dcca SHA-1: 8f61d7ae65514a2dcbf3ff04bf405f5179b6c18e SHA-256: 578b0623465131fafdd555a4ed906b1f532cf12c088a32c980b0088806373551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the heuristics indicate a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tokyosushilohaus.com/uploads/files/8209294452.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347bffa14ab---lepetirized.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/lomedakijudof.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/21044239497.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6ff9d22be5959147c9d9adb2e608642e/39558070003.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbcfdb440---dipiposubetuvurapis.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/wozatofuvajifugapetakuwof.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/latedomigagadolelopefej.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/semafepoxu.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/50777496657.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/78077780161.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbf64f40a---4796703164.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zadofonevonuserebavopene.pdfIn PDF document text
    • https://anjingliar.com/contents/files/sizin.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/pejidixepilovokamevewagu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fecd72b24---susinegabevabivo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe704a92d2---bubumetetokesoj.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/wivurelodobetoniwomanomi.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kixezipa.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/napoxufojekisozewolope.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/sulazigi.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/bisesa.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/fagivevapi.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/93063241776.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/86919985159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+city+private+server+downloadPDF 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_off0000c0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 15956 bytes
SHA-256: 1fc356a6ccb989dffa1eea097b5ccb2436ab45b9f29355a713f30dda38a6cffa
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 10956 bytes
SHA-256: 84a7ff069c295305244892d3f8e8db7d5baef6b5233fcd60d03bf0390a141adc
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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