Malicious PDF — malware analysis report

Static analysis result for SHA-256 451c278c41afd686…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 17:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 952871c5a0f9d1124235b6c9e00d7ec9 SHA-1: 12f0d96c9f648822e695220c229c32dfc68d5b5c SHA-256: 451c278c41afd686b814fbcf38afc6da5d3516f2100fc339471dfbcdb9c643ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous external URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to compromised WordPress sites, suggesting a tactic to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/682hoojenpg2ks21mqdonnvhie/20710731768.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6f8fpq5c1r06r9vchjc5q1rld3/valofisukoso.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8s40rr7q8p8m45701gqrragke8/29110205716.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5f2525b9b221daed92349ecbf0d5f65b/90773254712.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250a4584d13---85805570058.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1b755869---85761194955.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///wofudolakebixuxirenunun.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/wirisuguwagijoz.pdfIn PDF document text
    • http://st03.it/userfiles/files/20402159326.pdfIn PDF document text
    • http://umhouses.com/uploads/files/sokoresasigozevivalu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/162836575.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/20663799448.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/45503b19b262a7a8b8fb78b945f552b2/51208326369.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/6599135543.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062423233333934.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a06ef3904---82417758693.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/pagujuzinetazodebomed.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/16474068288.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/utlten0d09up71cnqtg42bn7d1/lumimi.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/pukimu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mkb5nk756j33jsa2nrhiblmmo2/30462621158.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/378da1d5572a4d1a36d915b1cd6026da/rutepuwabolojajewib.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/54464060538.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_235643.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4d40089f---kesavefopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rectangular+waveguide+solved+problems+pdfPDF 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_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 11400 bytes
SHA-256: a3944bca803c9472a5c4ae43ac3e81eef7af38970bfc743b2e9865d3aea7a448
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 20504 bytes
SHA-256: 5c29fd985371630f5d84722c3a8d99e539a40d0142b89caf1d2ec50edd992242
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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