Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d0167bfe2a8ecd…

MALICIOUS

PDF

91.6 KB Created: 2021-07-13 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1759c8b01fe48a3f689d27d66c354a9 SHA-1: fa9256b7109b216c4a3d894b87a8494582fd5fbd SHA-256: 65d0167bfe2a8ecd0b31475a762fa95d6d3f5a96e8f751d39da16e261c9fbaf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised WordPress sites using the Formcraft plugin, suggesting a link farm designed to distribute malicious content or phishing lures. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a6f401295---42169022825.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/puxudoxebenuxaxewimoburoz.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/latepulari.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/98263868237.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54840e864---80759902243.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d2581173f06---tazunixipa.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/xokukuja.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/regarebe.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/14632663210.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sifekazok.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8cdc78bfc9dc3a417841de829f39a457/dirasenevasuvofojometev.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/furitigoruworifapu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/vagakixadepenitox.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b70a77389---30450611667.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/43271324093.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/teselafimunavetudavini.pdfIn PDF document text
    • http://artospace.com/pics/file/fuboduvoxenipepi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7877b9d2---pipabamifas.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7vnnnu2tn838i3348c2da2m6u9/meruripiforosijebogidugix.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16091656c991b5---napuxategenafir.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/57216741958.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/11cd56e3654c6adb2859bc4eac0b8773/76275753140.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/42533882747.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/35b48f0df630db654b8799c6a5307e86/xazugofiron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=if+an+alpha+particle+and+a+proton+are+acceleratedPDF 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_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10500 bytes
SHA-256: 51d69268827cfa749d8fe5cfb0678a8ff7c2192e1ae0d32ff1bdcccc5d6fc45d
font_01_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 18100 bytes
SHA-256: 12084fcdfcafedf2b81b9224088476da400638d8d9655786b05e5b2e774ca685
font_02_sfnt_off0001489d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1