Malicious PDF — malware analysis report

Static analysis result for SHA-256 440e29e241e6f64f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 07:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 149ca8c54170b7f11591eb9caae444b1 SHA-1: e3d3ea66eb16dd0873fa0a27dfcf88bf432ac01a SHA-256: 440e29e241e6f64f83c081e1cbb6065bacada0fec365718c90e3a6e9da67b907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pistant.ru/uplcv?utm_term=all+ions+list+pdf PDF link annotation
    • http://mweb.cz/images/file/xadewonejijotukijabuvovar.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad3e3ab33a---mugejaderufefux.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/4809918233.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608956efe9743---27353359968.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/nasonobodowotoninig.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160746abe0ef56---jomunavonirupe.pdfIn PDF document text
    • https://etimes.mn/uploads/files/bijowoz.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161071de60be09---gopibifokixukabepefeta.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9be478fc---21312716073.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd443c9232---kisibobo.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/67395845499.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/49568001231.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kp06904c6v7acgv6r9hedflk2u/xebesij.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/33469348009.pdfIn PDF document text
    • http://safarang.com/basefile/files/rujadefobiruwikomu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/t3rtifvob3sr3h4hui38s9fjs2/20241696600.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/35e0d39cc4081ff598101e4592bc4dc2/xubedotebepo.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/24528058075.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/jejerorerenemosekas.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/konusonidalaxo.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/jijowokivedur.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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10080 bytes
SHA-256: 818d73aa9611a3d2c706af1fb4781c34ed912082739d15c24e652334a5a61a67
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 18644 bytes
SHA-256: c29db3927c902d3e0f9c6b3b99c0b8c91ad14622ce85781d93ee2d5940da0e3e
font_02_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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