Malicious PDF — malware analysis report

Static analysis result for SHA-256 5786ecd0f30c31fc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 11:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86e4001e79c13d2c6faea5e16cb088a5 SHA-1: 0046d9593b5563ae91b6c401c162899fcde173e9 SHA-256: 5786ecd0f30c31fce8b5663462ec8d789cc893c1eb183e17b8f00d6fadb7a8a4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports the lure of downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fmi.lu/userfiles/files/rifaluguwijuwa.pdf In PDF document text
    • https://emenu.hu/editor_up/zoxafikapeparupeka.pdfIn PDF document text
    • https://akconta.com/uploads/files/76929733382.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/perijemirelulugogolevomog.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/rijusuzunojedabexigivifam.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/bonijolilevobivipabi.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/43042792721.pdfIn PDF document text
    • https://estoniapools.com/contents/files/60222709495.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130837e712b8---64405026763.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/929e7ea64a1eb1305bbfedf3c0259517/lewefamamisotagu.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/davovil.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/winubarutubogexak.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/nurokavawubogotav.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/zopum.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/57017477316.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd47225546---betanixanagegenogosev.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/93839677852.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/mobimokixavefale.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/dotaronananozire.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/686504538d21ccc28ce1b114f21f5cec/nawijijo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/jipovebazi.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tilok.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/37979547403.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/mukute.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/52326968343.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/18361068357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mini+movie+maker+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_off0000ce66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 23504 bytes
SHA-256: 25e31a595050150c29ef02820af6211b47e05217118cff50b8a4b542d59ee812
font_01_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 10252 bytes
SHA-256: 6eeada29f7caff0cd69d748d566f71e720d1b933911e86d4c50fe654f7f514a8
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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