Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a7d161ed8d1224…

MALICIOUS

PDF

70.1 KB Created: 2021-09-08 01:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16e33dd96505c73c3615df05152465fc SHA-1: 5819830256a104bdffb23351f70d2fdd41ce851e SHA-256: 27a7d161ed8d122424fcc025595f2c176d9a324a34ca474e1315a417a865152f
64 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic firings indicate this is a link farm, likely used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the structure suggests the primary goal is redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3555

Heuristics 4

  • 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
  • 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://krisoc.ru/uplcv?utm_term=reckless+love+chords+in+g+pdf PDF link annotation
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/pelinem.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/nakugabonesunudesafoti.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c72057260---muvamowaboxew.pdfIn PDF document text
    • http://101balkon.ru/upload/files/30920703867.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/44b603895d04ecf4804ee7a355c85083/sedepusosebovepugu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a6961e3359761f5655fe14303791af2b/42887017570.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/97365346396.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/nadakoxufififadesal.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwiliwib.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/wojusosirumudujimutar.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/pikewitijegexumizafevuta.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/be4d4e34bba977165e70b9a6b3e6547d/59757805415.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4c12c85e1---rorujaje.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/39164918861.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/lilikamixowapukekewen.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610716c427de0---7307689096.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2ea8e237---lefugigofivisogawi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/rupivutidofi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3dbb85d1d---34978805796.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/47707722867.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/posafujajukidokogemuk.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0uc3vnstmj5ijcdmbls6ulcghb/6811659204.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/82923633587.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210515100345_868053187.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/79012088517.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/josulujopetegeza.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 10844 bytes
SHA-256: f53f599e12302e7cc4ab60f28685a86e7e1fa2f9048d4e9823417efb484e77f3