Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc74a212f54b660…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 14:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b579792399c96e7401bf63f76ca405dd SHA-1: ef64866ccd481de94774c0340a3dcbb16524f98d SHA-256: dcc74a212f54b660290d7f0a2feaf057f164b5da9b5d69c40f6ff891182b7924
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, including links to compromised WordPress uploads and disposable hosting, suggest an attempt to redirect users to malicious sites. The primary attack pattern appears to be a link farm designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://htapigroup3.com/contents/files/72268374661.pdf In PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/64240232435.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/39282690550.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83c683080---meboninevorebovezuj.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210904223021.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/77827955171.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/57235951984.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lajanebedokudido.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139867132d76---gowawunorodanewuxuno.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kixod.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/29094405761.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/saxati.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/22913280788.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fisopejezejugumoxene.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/5143066679.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613558ddf0377---jeweresufoxo.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/gisanapudujejexobexi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138a57b7ecef---47110449505.pdfIn PDF document text
    • http://ustunongel.com/image/files/3010404105.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/48949405664.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c49c7cb2dc6526e87ff7fe551a0bfb2e/rabixusoj.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/31275539113.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bopoxopemafatofuzezije.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091501286797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adblock+extension+chrome+mobilePDF 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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 17648 bytes
SHA-256: 52d3356815c8179298d3d73e6195e39f7209d0c7ce094f57af40290151a45a1f
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10788 bytes
SHA-256: 3cfd217e0255fd1272c56a881b2320c3280b93da61fce5a31d5a04065fa783b4
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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