Malicious PDF — malware analysis report

Static analysis result for SHA-256 697361ae40cfaeb1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 01:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1763e3876a62d8435f2460b013da1aff SHA-1: d94fcaa1b70ddcbba2f6674e32187b69541aaf94 SHA-256: 697361ae40cfaeb1fa2af0cb1c6431d58777e43f973882a5c4966ae3422ba545
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://allytemp.ru/uplcv?utm_term=geometry+chapter+4+answer+key PDF link annotation
    • http://digifast.cz/userfiles/76343119622.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/28288273188.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/bofupezejufizugorodokitu.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xukuniwozikusire.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/4130176144.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/45346247593.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/zitozasetalame.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87455388094.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/53845138964.pdfIn PDF document text
    • https://ocw.tw/uploads/files/reneboxogonisarawarivi.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/78317495648.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dba0e2b48---wibuguku.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/dudujovufawov.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614286d2450b3---22761252541.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05fc07a8b---66776037179.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/45872529700.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/94527799943.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/kilifumebaxa.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/83666285342.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pamuporuxizule.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/55820023639.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/kapagegusod.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/73423719911.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zagidobapetukuwudi.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/mikod.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210901152304.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/63518267842.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zovogelakijop.pdfIn PDF document text
    • 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_off0000b966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB966 16080 bytes
SHA-256: 28ddddbd77637ba145f74d1eb973a5f2ccabe029267a70e54450216be25f6fa5
font_01_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 10912 bytes
SHA-256: 0fdd3d7b5753f08b31a29e8207882e515e8cf0f942f6e267a04abdf15bbc9f39
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1