Malicious PDF — malware analysis report

Static analysis result for SHA-256 52de973e705313d9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 00:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 336d9a8957d5812d2d38e7e6589e8fb0 SHA-1: 812c288a64fc845a30a864108eea4d083f815b02 SHA-256: 52de973e705313d9669c7faea76a4fb471bbb28d0663ad5dbdab08f40a4f0dc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=dividing+decimals+by+decimals+free+worksheets PDF link annotation
    • http://clinivetmadonnadirosa.eu/userfiles/files/turelowenedorunurobemev.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/wosobujuxurexagewolopagox.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/dupizuberegakowos.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/tuvijokowijuxonavaxokoxe.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/faredimaberutigovewixu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0929fd14acf3417af2c426338ac07708/94249205243.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i16ipk02vjdnsq4a2dv4jhhq7a/sijut.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/75843328389.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294b6ca1715---nekunazevox.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1f87dd4cff57de6a313a58ee6a2ca101/39799466857.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9bab78b38---munolawekapilogevurebup.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983ebc15e2---tipazirivusubusu.pdfIn PDF document text
    • https://banghenails.com/upload/file/18886188673.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/48643757754.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/gafuzoj.pdfIn PDF document text
    • https://superpart.com/files/mazut.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/22469299683.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0f0504c77123f943d39761299c376cdb/71653800195.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jofegajilonusufozizim.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3fd06368---60247217321.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553e47bd97---89651104173.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/40273046259.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/48523136960.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/53000190489.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/17fc0f61f3879b0809aef23fdc343b04/penovesipisewavoj.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_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 11420 bytes
SHA-256: 12789727e9c648db9a381ffa33d0da937ced77db2ab48106b5d8f1df6c214237
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 18288 bytes
SHA-256: 210b635d3517c99ce2733b1d8a04ae768eb5ec724235f6767497663aa2625386

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