Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0288f0bc633cc4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 06:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 794988b3cf9f0eb61708a4cefb2182a8 SHA-1: ebfa2a3e430d1febdf3a72d6dc92240e0e9eda84 SHA-256: fb0288f0bc633cc494ebe39e6069299b54b31c99b300016f5f3fae1c9037e451
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a link farm with numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript and the link farm strongly indicate a malicious intent, likely to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=move+program+to+sd+card+android PDF link annotation
    • http://bloodfaces.de/attachment/file/radepez.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/razojufa.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/bofaxiwivarusen.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/rokivadez.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tukeves.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/3612699344.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fesirezizategebafofek.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/vosos.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/58221259787.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tezob.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/boregapoxigo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/292375383.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96756006083.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/97398321942.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/85d09b6a7a92bd633335d0d13f018779/22072764931.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/jujedagilubopus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305bced9ebc---sirikifuxewubino.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/55741219237.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/18594885546.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/93678990824.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/600151809.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/javibijotikipipuz.pdfIn PDF document text
    • http://renknh.com/ckupload/files/39610434802.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d282258e3ab16327359cc324aa1f1773/likofojanaxig.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 19420 bytes
SHA-256: 76f67ec9f403fe5f404867b8654d5d18af57bef08c703fcb41df5ce6d783d5bc
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10868 bytes
SHA-256: 6d2475ba40e9808e6e49d8d6b566d063eafb2d73eae9e14d0ae6ec286c492115
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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