Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b668bc297bbe136…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 02:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07db511ab67966731f2a3d58711916ee SHA-1: 3725709210f16de1422c59a1aa47e48b994d6115 SHA-256: 8b668bc297bbe136ed0b7f46fb16420f76c6573175ebc5cb9b17958f38da6146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=asphalt+8+mod+apk+unlimited+money PDF link annotation
    • https://mosconi.net/userfiles/file/fadetakuzovi.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/vudubijupunizasuvuke.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/tifigo.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/82828950262.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/jemofetevejasosubuj.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/96178687916.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jtr49uvgkmt3eh4icl51edqev3/laxorifatumin.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/nipasapurele.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tozexunib.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vakawumawovimukugade.pdfIn PDF document text
    • http://ifap.it/images/file/xesin.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/67129099474.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/tufuwisusir.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/6064159944.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/56286350649.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/99388571606.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/zozikobaxolabali.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137604e57469---xujiwop.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210907133355.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/71862244263.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2c7190fc91a15e736f6dd62f0d6cb73e/powanobesejujufigisom.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/69875081179.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/bixokadudotaniwabarux.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/67294080114.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/2897735800.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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 17780 bytes
SHA-256: fe7d3c3462ebcf16a8323bbb57cfcfa8c0975831f3b37d4c0ca8dea88b227a85
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 11052 bytes
SHA-256: ce97599133d1c670624c375ea1829b8b22c4785b979b5f9a8fd1a462b86984ee