Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aa1c64c1df7760…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 01:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0751a826c67379c99f51059e0db5109b SHA-1: e54fa012c54cb04a6d5f918faa50f81a6b9879f9 SHA-256: 15aa1c64c1df77600c662a87d2b0601a23cd3adc1dc0dfc4af74ff3fcad552c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with URLs designed to redirect users. The presence of numerous external URIs suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=catch+wrestling+books+pdf PDF link annotation
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/dff868726cdefb40baa90256688f4737/4786473630.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/rexubosiduzi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/8640929704.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/32343413715.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/905172485609b214b057eb.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bh888r6h6apjjfltmumsji8bg2/zipigi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd18f0d79---zofutolitemifi.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/xovugi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/kixuximodutupikiduwuliw.pdfIn PDF document text
    • https://kede.org/userfiles/file/rosuki.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/pevirogive.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb61f02aafa---59840967535.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/mukitegibisaviw.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/lolotilivovoze.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/98pkit5b1b8thljjtgf52uaqi8/28099473405.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/purajerelowuv.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b134ca168---femitopobovorafokiv.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/mukabiwudik.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/mevewilafikunabikudox.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/66609190642.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/767edc77066b9f76bbc141d9acc50f31/vikumorifutoninorolopeb.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/luzarutexumekuvogu.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/diwutu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087728095eb7---37711739681.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d4549de82bd25b23a37575f9fdb10d03/wexudujutalalovagudugas.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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 11248 bytes
SHA-256: ad91a5f4a61d29149faf38e21ed25ccdc4f07400bee6842dee87d06227ee9c32
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 17648 bytes
SHA-256: e178dd95dd61b8cbffd3df5607db447cf21d55a31f64b7a8da82435d9c072d79
font_02_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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