Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bda58170ea562b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 08:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e9fcdf94e746d8e44db561fdbefdd74 SHA-1: 930d10ce5c5a5d00100e16d3bb5ac7900e86d1ce SHA-256: 85bda58170ea562beb420df96e3ebd939d495d5bf8858d74db3b906e58839528
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=how+to+safe+mode+android PDF link annotation
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/89946619283.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vafivamidobinaniligexev.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/supowabamupaneziwuvatol.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/setinadolopesamolimeguz.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a3akd450bdcae5ldubj8gur6b4/bajezipolasosakam.pdfIn PDF document text
    • http://jngf.cn/files/file/fefawuvumatatogenokaditim.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142629d79556---vofule.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/bolexipikovitefijuwoga.pdfIn PDF document text
    • http://samtekelektrik.com/files/25783925646.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/getasa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nde83iuhl2meunbvk861fl6f1s/88020914707.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/xoradupivumes.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/wagipigarit.pdfIn PDF document text
    • http://classtool.info/upload/files/kipem.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/raxazoweb.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/1069446729.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/57232178333.pdfIn PDF document text
    • http://sartor.ru/upload/files/48862228867.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/keromimu.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/tivuz.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/tobejezukeposudeb.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/jizomopikaxagiwe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef8d2b7e3f---86357768345.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/15617716367.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/monizezolukepudibetevet.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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 10544 bytes
SHA-256: a8349e0472a38b025eb6ab26af1fbbca7a63d2dc56e7796110e43b1663e8dbf6
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 17512 bytes
SHA-256: 42e2f155a7594549d724293e1001fcbfc6878271cafe6b831723e3964cd8c6e3

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