Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d245277cb0e0cb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 08:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a78b2f24b90cb4b24815441407c9fd24 SHA-1: 53d5db67f52c512a5de01cbeb949168de2f50a90 SHA-256: 17d245277cb0e0cbae31fa832c767e8cb7c3141d7d66814a1b6374b4263b875a
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 CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://arket.io/wp-content/plugins/super-forms/uploads/php/files/7l73a86kf1hbs7klu9jr6ln0h6/51033403961.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b917660a---61752027242.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zagefafidapewepamipos.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/zitoxafafedigexofime.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/15c36fcc9f5efdcc66977716c919b1bf/nozawejofinilisokurivon.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/merago.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7acad070---lemipurif.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/vegijolax.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160affa381a519---rifegajup.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/af5cc8416e1f7c79dbf0b5040ee4a60e/gabodumunugaperomitevaz.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dakukokimugol.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070230e580ac---sonifow.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/29513384408.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/natexisav.pdfIn PDF document text
    • https://pokereshop.cz/data/file/manasonubevuvarikefaje.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705b1ec834b---lenunojefegexobulo.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/3060878163.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/fenomisowaxiwil.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071459a2c122---fixamotevat.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/87614552861.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/ranogafijijegepu.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/9616158773.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/391f4e792cd92e833d35b4d5cd973a59/jipurabinaniminanagipuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+art+and+science+of+trading+pdfPDF 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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 10816 bytes
SHA-256: a4d806ceb68ed488d47ee3e94866131d1f8bcca07ad756d18539c085381de9f4
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 18736 bytes
SHA-256: 8e78aabc87ce9af20e4a81abf6a9e27ab5efc9242bfac7dce5961340377b7305

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