Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2511a35ef15255…

MALICIOUS

PDF

87.7 KB Created: 2021-07-05 14:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3c12de8e2dfcaaf5c28f129aff35eea8 SHA-1: d0783efe67fbb9558e7e75e763bc6445e0d0a3b6 SHA-256: 2e2511a35ef15255f49732331f9c71261f58697210355d9b9f4dece3cf5acae8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to direct users to malicious sites, likely for credential harvesting or further malware delivery.

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 https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e333425---53378927146.pdf In PDF document text
    • https://maturana.cl/upload/file/55138885295.pdfIn PDF document text
    • http://bakoca.hu/files/file/nobajaxukikal.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/degokojibafip.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0b1286c7a33ffe662b758d51293f39fa/savigebufuvunog.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/jadefaf.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e01b46e5d5c6a0a6440f86af26cd9231/jigojupimiranadaxorixil.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/51acb90a1f52505cf1a468509e42edb3/luvumowilewexulokekenejun.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fonabimasebodifab.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e0af1e7b---wuzenulukikibala.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/refixegaranitisoxevakej.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa609de5c---nedakanagomak.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zagawukewibozigosimobaxim.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818eccd2c2f---18385260130.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nolijuviwo.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/32589509380.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f1b4ee02---lagexapenuzafele.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/46138832047.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83b03704af---40050133055.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608869c9eb7e7---89082613427.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1bf8ae934bf26734385b300a0329ef90/35184655113.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/23553b0fd9d5a216184704621dd5eaeb/20893153844.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/nudazilenurojuxufi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/edca4f9b192ecfac375dfd282e89f99d/mepidetinawaxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=5th+standard+gk+questions+and+answersPDF 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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 10944 bytes
SHA-256: df512ad117a4eb97b1d085c6b39188bef2e4aa132e900dfb1ded9de1ed9c1ab6
font_01_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 17632 bytes
SHA-256: c69b70dae56fdbafa13fe179b9c33d636498459e5220505ece5de06131fc0b60
font_02_sfnt_off00013987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1