Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5db236fd930d3c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 18:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ba28f4286a040387073fd8205f3161c SHA-1: 154f3579d25dd24f1dd086bb86cb9603f9c0034e SHA-256: 9c5db236fd930d3c642163ea706fce71c8ef2ef8f26110b2ba2dfc205751bd5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDFs. Additionally, it features a large number of external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=forged+liam+hoffman+pdf PDF link annotation
    • http://tiyuchangdi.com/upload_files/files/20210812_014622.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb1917d0d---65162636977.pdfIn PDF document text
    • https://pindimana.in/uploads/file/25553806820.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/18226853154.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76bc71ece---bupafajezakun.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/42135811660.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67ea4cf4c5---xudefofikaw.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/32292707361.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d99d6a8a3---88327526833.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bf085d808c3f320acf39572962e6028b/dimumujegiwajoxi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b7f5f0913---17657963812.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/bokibupu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad2658f1c---wexif.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16128f84559845---60399505645.pdfIn PDF document text
    • http://topas.lt/userfiles/file/70671138120.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/79cdccbda35d85b40b78a5c3932fcb14/17351753485.pdfIn PDF document text
    • http://balone.net/_upload/file///lifowejemesizel.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8e483cc5---pukukimedalimelidi.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/vatawaxoxudujenetidavaj.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5d5480727d489b8855425c7e9283b7d3/nivez.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903707a835d---pebolosi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6087e9078---16831889253.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/77008067258.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manajakaxalifidijabulavi.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a3f08e7c43b27f3506ef833ea835fd4f/42136194965.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/sawalafuboz.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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 10656 bytes
SHA-256: 74b62bb1a2316e05bb107874201dba55413471ce31fc747e53e448c972dd4279
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 17624 bytes
SHA-256: 96ed7ad7e992c69710aa3403635e9f8df00c16fcf34ebdf3f32fd29674c5f59d

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