Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8a745172988bcf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 03:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f30fc9bf6c1ed987bb39897a632be4b4 SHA-1: 5e2e245d08da5d3acffd3bc96a89fdee6423b217 SHA-256: 0c8a745172988bcf5fb320669aa4c5dec61078ef8248420e6d4bffe700bda2cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or initiating malicious actions. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://peak-experience-japan.com/images/blog/file/tosiriwitajewosok.pdf In PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/1858048163.pdfIn PDF document text
    • https://brukspec.pl/upload/file/87996030967.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/magawitewalomo.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/921659665.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dcc3687c---82969488353.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/wasulu.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zigojeduxulasuzer.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d6e2db4a9481c979382c0fc6af1a8560/zaridefojono.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/semewurepuzisuwedexu.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/99662334828.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/pezujaz.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/wujapupaf.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/wenetavufomewusawedepumoj.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/60b645620a56d4285566c0f7d232ac13/kejitofiwovonivojigus.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/edaf2c2188183739cbcd28984ae2501f/22255957397.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/67317415664.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58742996165.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109080701377102.pdfIn PDF document text
    • https://digireg.pl/upload/liwixegafakilamaxariz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c30u5lfhappfpvjb887cc85092/6506752527.pdfIn PDF document text
    • http://khocabien.com/uploads/files/doxukinasekixotafix.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/pirijazimixide.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/velakotituzejeluxaveb.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/logexebodidimugalagaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fond+d+ecran+anim%C3%A9e+androidPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 10348 bytes
SHA-256: ad69c710658b70c77ea18d4672b9473776f453398afd5817d2eb61cbc403540a
font_02_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 19248 bytes
SHA-256: 0385fa4bc54c7efebfa102d519a4b38c5d3d5e9fad69912b9c3103adf993ab47

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