Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14ee75ae95ddfbb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 04:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 344f3bcd9e902b27fb71fc467d0b1f09 SHA-1: 0807198d72ff82ad338738e5c699eeb91d9dfbcb SHA-256: a14ee75ae95ddfbbfbc5d26819e8367200d2fe250f04a0e52c70b584b5b156e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to various external PDF files hosted on compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://nbc.com.vn/ckfinder/userfiles/files/xukaxiva.pdf In PDF document text
    • http://scpt.it/userfiles/files/pedobux.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613913c1e4853---13436649125.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/gumekawavefap.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/56686114213.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/kedusudadodopesufadoxonob.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/k90jptl583gkt6qkhso9ib7lj7/xonolegevamikuvubi.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/94092996603.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/dukojirotidorutiwin.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/letisanujosekisururas.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/kefaxepasakoseku.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161319d677add5---badefejujimatukododuter.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/6332246909.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/87768060290.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/gosajafonavobever.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/kozokodipixa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149920ccab46---30129004970.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/64568451163.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109260748158760.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f2460ede---69479610038.pdfIn PDF document text
    • https://castel.ro/userfiles/file/rexogozomemo.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1337832370613e9f9b63975.pdfIn PDF document text
    • https://diphong.com/uploads/97087963771.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/topip.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b02de7ddb2173b6f5a5f2a2424cf9243/nunifokoratakotuzeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sideload+chrome+on+firestickPDF 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 16660 bytes
SHA-256: ec80259a1583421b6dd588f2423b076485a3a814eedbee5321f7eabd0f225f07
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 10908 bytes
SHA-256: 96c21b87d6653c07469c2f7553a3cdeb4853085a3ffe12307a6c193eee9b6ddf
font_02_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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