Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2daf1b86717318c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 08:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8235a88ec53878d10bc27e5664914282 SHA-1: fd3752beae7673f452aac380f464246ae4a84655 SHA-256: a2daf1b86717318c967dc7c5710b953d179a44143144f88d5e5e671954214383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737a36af0b---dipafadasa.pdf In PDF document text
    • http://scamps.biz/userfiles/file/80507625346.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb55f7b36a---terazirusotudavipeturuga.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/60547936450.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c35559add---tevovibezakor.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/ligasukido.pdfIn PDF document text
    • http://jarosi.hu/files/file/kopomodufori.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/41935591277.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fukazabivazazomik.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/nuzupezujubewafeji.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/rifimovivekepesizagof.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/lagovedivamutirofofuj.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/janejoxanapegiromir.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944baabc7bc---vefivipejosi.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/wobumigarupitedilutino.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70081ae6c0---45651214081.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pal5mp1b4p6luikkkpo9a2d8t6/dexuxolekisiwik.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/8918894348.pdfIn PDF document text
    • http://proxima-design.cz/files/file/livawufudarenivilotedosa.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/jexadolesisudivib.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/98260197672.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/9881952230.pdfIn PDF document text
    • https://chpcentre.com/files/file/20472529233.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/62630836583.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ve1dr47pjvovu1vdftali1tvtn/rusal.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5b4edd1ddf77fd273d997ddeb848c6c2/70684741151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sd+card+video+recovery+apkPDF 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_off0000c2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D4 10440 bytes
SHA-256: 7220a831de072ec4bfa2de0f466f103da510480970a8e77a5953946c6d569c41
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 17188 bytes
SHA-256: 3684bc260fb922a0e9a4d42bba3ae95281e4c4bac6dcc8723fd486f6d11db36f
font_02_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1