Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f704239c6a9b96…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 13:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ab54dc12a3616efcfc8438faeefa4e3 SHA-1: 9e78d0544ffdf6433e3d59fd8f0467f0a4b9aa2b SHA-256: b2f704239c6a9b96129b9b20f6f5ba959c2f40505148a281bc7c66587251cf94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=lotus+365+login PDF link annotation
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/kisixup.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/mixusipowenigozos.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pirugirijawusole.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/zawekegubaberuzavitopi.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109171310127695.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/bubowesulir.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/jofutojegelarolajesokoman.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091518530448.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/326448161.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/18871785325.pdfIn PDF document text
    • https://designclarf.it/file/41350655508.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kewejonadekopagutanemov.pdfIn PDF document text
    • https://ekransamara.ru/files/6378642013.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a10302bc07d6cc204772f37290359115/35652429098.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bf7892d42---61906868977.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022de1f92b---vununowefuvarodexinenufan.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad9499308a---76893973077.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/munegirofana.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xaronanu.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/92729841044.pdfIn PDF document text
    • http://mastervin.ru/files/file/pudusezikametezu.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95846825217.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wuvesuz.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xetinetagu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/62117032678.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/fegugobuzeligix.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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 10420 bytes
SHA-256: 0bbb2dc56a483361d457bd0f764135360bc51bd2d8fce7e7e8042ecffcc9f77a
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 18336 bytes
SHA-256: bfb6ccefa4ffa6bcdae985998684f005cd2604e09b80792bb94036b846b7591e

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