Malicious PDF — malware analysis report

Static analysis result for SHA-256 93db84fa0cf6c3b1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 19:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69865aac9028621f9f8dd570d2e41229 SHA-1: fcb64deee7becb02a57b4038d3de64d7f7437c04 SHA-256: 93db84fa0cf6c3b1fcb70e44e6c61b00142c076fe594420d4674115b565bc7d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=complete+the+idioms+in+the+sentences+below+with+the+words+in+the+box PDF link annotation
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/80026636555.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/17165829031.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sapaluviposu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036da4677a---27398543335.pdfIn PDF document text
    • http://computerdoki.hu/user/file/54393579030.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/5574486634.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf2de6b6b---81699999342.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/36880811653.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/manoruxikinik.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1946268026.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/kva5smlghkkjht5rrept255e76/59742270927.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/74283884854.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/nibimafenidebovezowapimif.pdfIn PDF document text
    • http://adice-area.com/pictures/files/69114107098.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/63074864949.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/93303656476.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42f406303---jaselipavuloxavatesito.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/69598526378.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c9e6d846---58675130885.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132936056640---makupunol.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/naxitokogotemajuseropoz.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/murovukaxasunozasexo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wipoje.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jesupavugudoxenuze.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kinade.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/42013559795.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_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 18216 bytes
SHA-256: 12bb33435ab1c7f67661e708fb7142816217b4475043681f71d13104082a7c06
font_01_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 10976 bytes
SHA-256: 7d66b510ef0da3c186772d12b8d3c66f39857c0f4b8b19ff5b593716a0404885
font_02_sfnt_off00013703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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