Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f532dae83907be…

MALICIOUS

PDF

75.8 KB Created: 2021-08-05 23:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff8f100379b8e476c0e90c8ed9d23f45 SHA-1: 42f029337104ed8e4eddc39b47a219d4335fa67f SHA-256: 87f532dae83907be1b622d5b8c650c8480277681eb14d16cc928ceae0bd3fa6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://churchtextile.com/userfiles/file/xukosegijowa.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984574a011d---liserafibodumenozijut.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/maluzujutijof.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fe00927e---93101968577.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tajulatakezimumatulipabaf.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/81095737331.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/37467832201.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/76dc7f10add89983045c0a16c3a43538/taxuvos.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210623123401.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/saxopapafigexabezu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/69bf5c126fd78b393149dcae525e8abf/lodanefukazukifugozije.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/794cbcf07b2349581f785b4af6641526/wobatinixakowuzisevo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0f91d32abc50fe1a386d74fdea0fa0c2/53341815108.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae88d918561---mapuvakuxeguvimoxiz.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b92c157ad6b2d49ad4aa3c7dc3798797/fovajujuz.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/noralor.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/pevegagegexa.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/sarerixasozubaju.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdb24e952---dapilifirabazofujojupo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6ef2893caaaf2a92c8d5ac5c1318c1bf/fisuwofofikanufukura.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4d1f94d4abb9d95ee4354d65c5c77d37/15090922310.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/46287336581.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/73538375408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+vampire+diaries+season+2+episode+1+watch+seriesPDF 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_off0000c4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F7 16164 bytes
SHA-256: 7013d1b0238ac4bdf7a6d3b6b282b5913757423c2f6d958a58859a497098edad
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 11020 bytes
SHA-256: e47bf32c53a15c0a9e7635e07a900185639e361b308684e3a0a8e11f3908fc7d

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