Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ce661483887fd0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 05:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7cb5d40d4de18d98704c069eb1ea0cf6 SHA-1: a2c679e78f482a15f742a6835d7a93a3aef3ca21 SHA-256: 98ce661483887fd0110dea778b899eae8b0efe60ae91bd596a8ac232b56e8a43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://getwealthythisyear.com/ckfinder/userfiles/files/91415989870.pdf In PDF document text
    • http://bulmarconsult.com/files/pamajugojenamuvetapiwagi.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/lemiwigugo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/68604628569.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/voxuzar.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/33403222114.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/wigab.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/29506177883.pdfIn PDF document text
    • http://grafitym.kz/files/file/wunilabopebetemumi.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/ruratenetaduj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca3426e87---nigidiparusovefevifigiro.pdfIn PDF document text
    • https://mar3ol.com/Files/files/nufeparivirusamapumabufe.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/takibuzunupinadowalebakub.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/427e0d63a8c7a563a78a3508591b863c/12005615717.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/vefejapaxusabifa.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9lsna99dv1geu387fct5ltpn27/57483860357.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iorc9u938kjb2jnm97s30bh6sg/vanerovop.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/57704968768.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7eeb179a---diretomajonugopase.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/59283250512.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109112113436968.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qtakoklbkaqqv44rujkpg3snp5/semulesulokivezeg.pdfIn PDF document text
    • https://phukienbep.net/media/files/segemuxuvowomalakaridir.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/88968815731.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210902_802AF104EA26E40E.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb72a050e7---29247964943.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/61814897591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ldplayer+5.1+offline+installer+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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10900 bytes
SHA-256: 6cc883a9d52403f66092ba9975d3345e73c38c008f0d1d3c4a35b149f6b99109
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17044 bytes
SHA-256: a201e7123d3a14dd5e84d9c0fcd56b46b15222f8695afcf2f0a42741e68bef7d

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