Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc31edbbb7c9c441…

MALICIOUS

PDF

89.9 KB Created: 2021-08-14 10:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ac12917d5aaf2d0563ff053734fc2d9 SHA-1: 6b7f5bdfaeca0626d8ec3b10979aaefd5195fe70 SHA-256: bc31edbbb7c9c44185e93ddd2cba518ccb93406bfe84fa0a4842554fe60966a6
164 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 functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=tears+of+the+sun+full+movie+in+hindi+download PDF link annotation
    • http://dotacjedlaoze.pl/userfiles/file/67013126496.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/2728273516.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c7580dcefe7a34f8132e882fc91425db/wugolijomovukukabaneme.pdfIn PDF document text
    • http://195exim.com/datas/files/70842517950.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/87194911325.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4bbce1462f027096cd2326899468a81f/65557212695.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/51b97f6d10538f36894831c855ba3479/19257136697.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/46953412362.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vopavufekopaderinotu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8955b821b---botezafebe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9638b9df---kefonilovoxijetovuwixosa.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/fitonajosoxomefezumudat.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/37820729329.pdfIn PDF document text
    • http://zubrcup.by/files/files/56431544875.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/moxezebob.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/23743810236.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/mirakofixozobasatawelasil.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/14987542908.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a461c841589---notegusuwu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1ku2vp1h317duf74o64r3lg3mc/63748393200.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cc0bc73a---24346368565.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dolitotejusedurasono.pdfIn PDF document text
    • https://basisnomor.com/contents//files/26896804926.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/mosikapijodapan.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/92706469246.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_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 10832 bytes
SHA-256: 5aac2c2f7812d33ec510415d0e462e96e89e84f119a9702848c1e451b7da07d2
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb