Malicious PDF — malware analysis report

Static analysis result for SHA-256 460ccf739a7defe2…

MALICIOUS

PDF

151.8 KB Created: 2021-07-13 09:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a7c539f5d78f5317c932bb4a64f12dd SHA-1: 0eed05b712bbf9f723e11e5d9d2d913296529385 SHA-256: 460ccf739a7defe281e3075a82a830a6c5f18cbf548dbc611a5037139e57b83a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 http://pc75.net/upfiles/file/1624812164.pdf In PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zuwovumobud.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/63009867413.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/45akbtieah581chjro2gdikg38/sevamogiliguvuwulomexi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ioe425pahf2kt2hbnmhutflj1l/lifoxikezotumebaxalaruji.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/sugulejazalomesosalaxiraj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7a007d1a---89020459250.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d5315a706dcc013236dffdeb5868609a/99684069222.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/61109e9d5eb57f945041f174e94a56ce/20090018921.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc7d1169---fijivamawilet.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/70d249727738c81865de249b005bfd8d/tatavened.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h187evu32kqeusqim5d96tf6k5/82719793680.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/75980673900.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2245756a1da46763277435958dba5e06/susigosigefejesifo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1fabdcb1---vigufibewexexegefu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cbeij2to31met6eigk4lp3kfk5/dunof.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/10k2a73eceiak91jhivadkr1c1/rafobojaxame.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7b7ba9fab---lajejetikuwozaxoribitob.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160788057c8315---mudixin.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8cc507d70dacb5079f99a78beace5411/jebixomew.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nabejanep.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39421a97f---gegurodesirivakidewug.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/63166cfa90fff3e282d51363130df1a1/kamokarikodokove.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1152636a---2646759486.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/60372360715.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80f014afd---dabasizujugarakina.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6r8v9bknb1tomr3cl43d0baj1o/nipim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=socrates+the+thinkerPDF 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_off0001f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F34C 17884 bytes
SHA-256: 18932566824da3d6e808f8083e84adad4fa22898ffac26737062ed2142b82507
font_01_sfnt_off000221d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221D9 10448 bytes
SHA-256: 7e4d344eac1216fd6324c17cee061c00a7410751319059a7a01dfa6d9660cb08
font_02_sfnt_off0002397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2397C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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