Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b64e999cb333a1e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 15:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8464c49eb8f82fce5b41cfc1e18e0f3 SHA-1: cdea3d5308acbcd6a4c5503b9ecd88520803bff2 SHA-256: 7b64e999cb333a1e65e9de2b858fcfe1d24a7fbe34e6d393a198ba5ec7045603
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic findings clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=hours+from+now PDF link annotation
    • http://stevis.cz/files/file/71265543051.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3e619a3919dcc7192623388b96a73a29/57552307740.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/67483160646.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/69037061712.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4ce53f7894ff6ead486ab730b08a5b1b/pasenexavizurinuguninade.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9676c1fd9---xidad.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b81bd7d7b---lisozogenozujolazubasej.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/98245948299.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///dosupobujiwuxuzinul.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4pvl2pilhqg6hb7sfjnkj2248q/94149043315.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/kogodatakaxare.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/881be77d7b234d67fc96ab30f5708eb6/41908305066.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/kolono.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a57342e2---23059980052.pdfIn PDF document text
    • https://actor-conseil.com/files/file/51201527466.pdfIn PDF document text
    • http://gewald.ru/content/Files/gitirisofewilofidij.pdfIn PDF document text
    • http://arslanemlak.come/file/xifugujulakamijene.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6f887d4e---39569354165.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160775ef7daa06---janow.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/37134755503.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dhl8m9rm818djc2m27olgrcij1/9827797563.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/buditizijozadas.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511074936900685.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///7821579221.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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 10020 bytes
SHA-256: 27e3f00ff345d156ef1f64cbdf0d7ac27cb504bef74670c1861f5fcadd54d849
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 18356 bytes
SHA-256: a77ba025811a8be334e550fe89b6045da49df5a3a744a98565579b666d3478f7

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