Malicious PDF — malware analysis report

Static analysis result for SHA-256 085ed1af0b264462…

MALICIOUS

PDF

78.9 KB Created: 2021-08-08 01:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7de5c8b93e345bd914632c06a8fd315 SHA-1: 34c9d5f8a43e611b72fd3cdcb288b8e8e88003c9 SHA-256: 085ed1af0b264462ffbb1bcab7de09672cba5ddd2c7b562c449b9c4869ce5a73
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to direct users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb756fd1f---51227690224.pdf In PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gatoxov.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c186464ba9d---4402987587.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f1422eeedefe3ed16152486a89d422f7/vofejokuverajevufivezefew.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/56476306354.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161095af5b5400---48187881067.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/61994970764.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ks4c1jg4lqn0e8br2ks5ineb5/wevimudat.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba9de139e---risitisasujozuvibos.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/13630428539.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xakulomowovamagaler.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/mijitozavaxadafudanosef.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/njgagabra6ts6mq3la5qf6dob0/17406211754.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/jovojawipumipokaroteli.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/35473480671.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/xaveretapuxiwotu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/koter.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc855b00a7e---25932138859.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/36076755506.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/c055bfahblte29sfd3hr681fre/bimejok.pdfIn PDF document text
    • http://pneusmarene.it/images/file/54257533740.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/48230277848.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/gesejebuzakolikaru.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/bapuwir.pdfIn PDF document text
    • http://didopack.com/files/59652968098.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/91922382987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=como+calcular+o+seno+de+40+grausPDF 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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10852 bytes
SHA-256: be69a751c286bc2c64b56615baedf581dbc6d2494ef8bc8bb6b785cfc9efabca
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 18988 bytes
SHA-256: 438e7b487c0805ab5bba0b197519ea78020a68e27bc281a056cb81027f088c94
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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