Malicious PDF — malware analysis report

Static analysis result for SHA-256 1710e17628c42a6a…

MALICIOUS

PDF

111.1 KB Created: 2021-07-23 09:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ac6ab1a91849ec817a4191bdb2ef7df SHA-1: 41aaa95875ba04f55e04263af120ba4966f17b98 SHA-256: 1710e17628c42a6a5626475c14762fcfc7b2d2f47f3c8d591da27051eaa70850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, but the link farm nature of the PDF is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/49uqk8hfqpia61l2s7nbvcf5a3/dadigu.pdf In PDF document text
    • http://studiocalcinoni.com/userfiles/files/potetedi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0619cf89---dasafiguzelibareluleguv.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/wutujuwavapekajuludelul.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/91276166988.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/bofasenotufasoxepinovo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a79ac61f---zixosidugixezimegipalofek.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8f220b5b---91168498513.pdfIn PDF document text
    • http://planetamama.ru/files/file/tugosolimivi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c108222d8---xinusituw.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/46403096518.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d4e6f807---32899145004.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/14014682546.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607596a5a0473---nikuzezixilazawe.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/woviferamak.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/7229414399.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/47373128581.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3teliq7di7avjhfr841665evi3/36093499229.pdfIn PDF document text
    • https://inifd.london/uploads/file/mapoziluvasitekesa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff794b947---21023787098.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/r07ki7n3dn9570tshik5g85pgp/nenamubonile.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v41e59vjvcvp496a86u32f2f1q/tidokozilililewakikula.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/82162153131.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/33683716281.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vozesukabuxipijev.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/nopefatimikipagimapuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=skyblock+for+minecraft+education+editionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 10988 bytes
SHA-256: 914577ce83d6e0b53cf919b96b343f3bf23d7c23f3b68a189e74ce5f73c1de37
font_01_sfnt_off00014c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16499 7364 bytes
SHA-256: 7da6c2e1cabc5980a298296bcc5affab13408531023c213acf4c71f2f9be4b89
font_03_sfnt_off00017df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF5 17764 bytes
SHA-256: faf7a965f37022e769f7125adaa2d7d138ad347e1a57829b689fb13cd166a1ed