Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d17fac475e2d649…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 17:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89d841526bab3e3dc2972e63ab30a824 SHA-1: 53afac8dacf699dfe6e1955e56c11d8f65e70506 SHA-256: 9d17fac475e2d649d379230bdad4a9b831e8ea6a8b43e007d8d6c58f70e6473a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content or phishing sites. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://synerhu.ru/uplcv?utm_term=wedding+invitation+video+templates+after+effects+free+download PDF link annotation
    • https://creteotels.gr/FCKeditor/userimages/file/79367399386.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dfc54a8f38c868c96046679b0271d9a9/15838778437.pdfIn PDF document text
    • http://billsky.ee/files/file/zavobovimegoredasuxopufi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8408bbc304b2f20e996ee5808fa7ffcf/72139470426.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/27062344163.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2dc18796---gifudebisesonebu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/samix.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/bewilasuleguxuzajuxide.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021042923192773499.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/48447652503.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xituxib.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/zasetowazigapujeta.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce872dc654---58434142294.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161075c5c08ce1---81642095622.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e804c3e667---91918663443.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/kekumadamiwevigowoxuze.pdfIn PDF document text
    • http://uco-kampen.com/media/files/vedakasisalorepakosabi.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/97839206633.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ad4a6a62---9532820004.pdfIn PDF document text
    • https://menu2uplus.com/images/file/97668356875.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c2a4fc9f8f7f0d0568ef3eb2e1fb8e7e/katavakukal.pdfIn PDF document text
    • https://egca.fr/userfiles/file/66207748645.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/70830061970.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/mopukaxutovejezalalel.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/4t4svuabi0gbi97jt0mulm36e2/zegedupovofevisosobutil.pdfIn PDF document text
    • https://onecre.com/images/content/files/1603501376.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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 11108 bytes
SHA-256: da52aaea0797c1fadc5f80cfa555900bbd060d3f1ae509a1f64db65fa1bcfd2a
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 17732 bytes
SHA-256: 637a3576996032c88d5421015ccf5ab839985e70ef806396ceaa7b56414b6960
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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