Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed53cb6624b2fdd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 10:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 457226f862c0c1ada5c99bb58d00f717 SHA-1: fcca8769013c5cebcf4b1591ec15836a30ce0300 SHA-256: fed53cb6624b2fdd94d4fcbb06576bd4884eb71a9ff1d11063d74eedbadbf670
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://alianzablue.com/aym_image/files/12344848986.pdf In PDF document text
    • https://zerling.eu/nico/images/files/zavojixufajub.pdfIn PDF document text
    • https://btegypt.com/file/51948818552.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109030827344602.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/karirag.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/figubudo.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/84320437372.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bqk7c4fb0n9n5ups32qcabao6/36176985576.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/wexixefejerodoronatij.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9279154815.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/wawogojumumogapirixi.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/32327056351.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/77062138377.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vopoluporosuzexaw.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/famirufebusijisetifa.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/55669449110.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/13270941461.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7946e549---32368546383.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/fodiz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317ac776f09---nuvabubipewurisibarosowo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b2eb37slpn875ha7dutq1dh8b7/90060996690.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kinuwimakukukonajukin.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb5b08b41---jilejerigeralo.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/bufomudigosejidabaxafusus.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pazukafaja.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/toboza.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/godoxawozerubuzakokote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+phone+as+nintendo+switch+controllerPDF link annotation
    • 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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10704 bytes
SHA-256: 7d8ecedd61c6d35b3944c84c3ce0d3aec1965430a5cb338bea34adbab5c6dc94
font_02_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 17628 bytes
SHA-256: 17f8df973de418d009f6848a024cf67170fa180c678a4d87902182492992b215