Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a02b8bf72a9c45…

MALICIOUS

PDF

96.0 KB Created: 2021-07-04 04:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce3967329848c1e547b20b4ff51113a4 SHA-1: 817c940a0d31e942aa3ab66577cdbfcddb4ef70a SHA-256: f0a02b8bf72a9c4567b08d2ee12982b15c29a6439ffd21dac26c1d85d7b35c23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of embedded URLs and the nature of the links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://coretry.ru/uplcv?utm_term=the+five+kinematic+equations PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/909cf48f7d0c44716280611ea426e56f/sutalisobawederugiku.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/rowalugogaga.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/49218749830.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4783e40375ef20ea62ac964851617f82/tesesaboj.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f249fe2a08---32479393668.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zesutagusujexikatiwi.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/58053647625.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1de6e10361aa1a3ea3ddc257a22deab0/70493308131.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/qmfkc33glcn917pmtalfs7ofuk/ramopirevomiragire.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/7717933043.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4e3fkss5a75uf2je7ucojnsi3f/92770890100.pdfIn PDF document text
    • http://szpk.hu/_user/file/tamiwunireposirusoret.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723076bc1cd---busoto.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddff2f781---bosopexala.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3a43ce62---funemejituv.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c864c3412ff---91036250969.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608789c213c68---xazasolowolategisowetuta.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ffed2351a43f50691d64bc44848d1c6a/zusegexizuwam.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/23507984917.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210624032518_w5cu88.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/jibogunejakozowolijuder.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c66d7d558---40717134422.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u40b992avmtus54nj127sklj42/sazepoza.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/edb8b2fe133567f318f4a8345ab24326/81306391362.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a874665294a---paxokodojokevozogovapexa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2a208438e8defbd01281c8e5ea79c15f/24593280241.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2851633e9---16636626009.pdfIn PDF document text
    • 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_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 17544 bytes
SHA-256: 30ac6e3ccb6e9b72c15285ab95a43a53eb370ef493b32cf475f879a575b1cbf1
font_01_sfnt_off000141b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CD 10824 bytes
SHA-256: 86ddc9e5e5207e33f345201e3dc9bd777d98d477245742817893d03ad41c0198

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