Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf295b38c5c0b883…

MALICIOUS

PDF

129.1 KB Created: 2021-08-15 08:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e8de32135ca2a32a3e83f2f15e32057 SHA-1: d2910095488379f6475e38078a4c28cdcb6fb04a SHA-256: cf295b38c5c0b88390dfd5f8693e17e4d9ca085b4b231788e6e35b8d7cfd82ef
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests a link farm designed to redirect users to malicious content or download further payloads. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised upload storage for hosting PDF files, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://componentcnc.hu/uploads/ckfinder/userfiles/files/muxibusutavuvopo.pdf In PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/dasobifo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e8e4060c3---36842396352.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e43439b61---vasufebezalotosa.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/nejikekerewexalozada.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/24278143870.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8jaqbgeck7j7ck1djrrhib3gg3/werufufoxov.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/3771765127.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/21605553807.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/monofila.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/49241c51d297f4d1ae6bda81dfe399e4/18899895392.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/cc7907524348acbb951a7f0f14aa3cf1/wagawuvarobavatategur.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/71617910466.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/89104176825.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jumakewujijunegifuvujoxi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gagolofuraj.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/17377262424.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vivuwok.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/lrbbdb7kupsmggim3s2h84o0sm/mebunijik.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/furubotirotef.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/aa0e52b093a5288cf00639ccd40730b9/dotodug.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0e992cb9---72079379245.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/melufiwewasog.pdfIn PDF document text
    • http://nfc.soo.jp/file/mesonevesot.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/70733417003.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rifufemiweduzevesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+topics+for+chemistry+project+class+12+cbsePDF 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_off00019a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A04 15936 bytes
SHA-256: 46e4cd02cf1a5090a251679fded3a597e8ed1c740fa7b015606319c8d0d2a978
font_01_sfnt_off0001c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2E8 11248 bytes
SHA-256: 4aa5ff8a2586a175079a75d57f6950fc667f87f33c32a4a9d82547a4de826ecc
font_02_sfnt_off0001dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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