Malicious PDF — malware analysis report

Static analysis result for SHA-256 c423ffa1e0ff6c14…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 07:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0313f0e4c11c6d2fb16f0bf89986579e SHA-1: 076981c96b6727f9ff7e2f485b13111d40e2780b SHA-256: c423ffa1e0ff6c1407702f6e38c67ca730df939a62bd896c30689b270e70639f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.peritaonline.es/ckfinder/userfiles/files/ziwafudavosozijipunib.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212ac0cce9---58067928527.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/3107999029.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e74046623fd---pabawezijok.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/12912059489.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/33514730012.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/bobivotexamividunowuvodaw.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7f326d2e---kakulevosogig.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/37816425455.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f0ab8edfa8e60e92e69ce5beffcbd249/mogazigapasib.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/45262016511.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/32112592479.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/vorapofopomalisanogugixu.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526214920.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/biwosibarusujavalutetugoz.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859eec8fd00---20968942370.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/88861372404.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2qqj5rlsphvohkq1cfb7h0e1u1/mesoninawexaso.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cf325e1a---moromugi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/e8tr4ngk7o4pc09ti974dskmma/vidunipinogasoxotilo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cef71a5f076f7248b0b5d2fa5ac49682/xulelilidopemilizodumil.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sixifolusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ap+human+geography+key+issue+packet+answersPDF 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_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 17868 bytes
SHA-256: d7e7754f2ec5e2ec8a020857d38dbc0f617b133fdb45e46d2e9de4b9006d2c77
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 11148 bytes
SHA-256: da2437e34326cc1c809620d108ed3cf65a4732868f4b4518dbc2751e2ced6828
font_02_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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