Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f8bb66c231e6d2…

MALICIOUS

PDF

73.1 KB Created: 2021-10-05 12:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d78b5d0100429268066fdca6eff1ec3 SHA-1: 71f84113026a76c088e1cd664c27cb92080b065b SHA-256: 68f8bb66c231e6d24a4f7d10cfda8bf879c9ee61e43faafec5828fdf71a0b57b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious URLs, serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://czus-lukasa.sk/userfiles/file/91186462359.pdf In PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/28932054865.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/76521043057.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a9a524c966939b4eceab9c2f30cdcda8/30586095922.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/20627587732.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/vumalutetitegin.pdfIn PDF document text
    • http://shop-cartuning.com/userfiles/file/24543336088.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138553e15d38---82862180001.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/l57kae4g6ejko7238u9q6srsuk/93736617651.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63786739302.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/menomotumopoza.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/buribajubijabagikevolo.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xawekaduguxavimenukaza.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/84192901765.pdfIn PDF document text
    • https://cet.sk/res/file/99167770542.pdfIn PDF document text
    • https://felicityokolo.com/file/59549940026.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/81147625187.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/vixopodugewixodexu.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/godibewiwazesaw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318e7e1946c---tejenagebenegafuvumenode.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/18861820922.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161492c79d6735---59218437818.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/bijugiwibenopisinas.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/96850355338.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kilovowikegazizemamu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540875e9f9---bolegotofenuwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=information+about+non+metalsPDF 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_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 10568 bytes
SHA-256: e51b7c41eb35ea86183680ac288644a34067901f0af6cbeb44b6e1311f51f1b8
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16428 bytes
SHA-256: 526ce722e6566477c627e1a90fa95b72d4b8c9a147ca4ab4a00e02645a93bf12

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