Malicious PDF — malware analysis report

Static analysis result for SHA-256 6119f93d5e2c3a49…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6a242a2756689404e3d1b05f6a6df2a SHA-1: 5b4e373f1c8f1e388ac9960d0ee2c8e22ea260d0 SHA-256: 6119f93d5e2c3a492d8c1b548986ac5cec6c46cfb7561aed6b7ebef76aabd70a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML classification, strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://clickvay.com/upload/files/11084048340.pdf In PDF document text
    • https://hamayeshniroo.com/shop/file/22660696400.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd43872022---69166034830.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/16444881913.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/funetuwudok.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/tesokogotageluleseviko.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/44029471752.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xonilixivo.pdfIn PDF document text
    • http://etkenkalip.com/files/91797680970.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/10084481813.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/ruminisurepuvoxujelufi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vagipotimepurofadunima.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/80063899436.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/21513889841.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/58752827.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zesiroxijomi.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/75377058470.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614524b0bc07d---vemenawapujenak.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5c0c241c4c1a0b0c54c00ee48e7bd69e/35455914664.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/juzogejasatakoni.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2c6c70d6---62673641823.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/woxivibo.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/27664853538.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/6593194935.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/kebesexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=super+30+full+movie+hd+free+download+filmywapPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 16972 bytes
SHA-256: 39089ea63d0420047b0313e44a7c86dde17130e98d66273e21bf6fa0f0aaabeb
font_01_sfnt_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 2088 bytes
SHA-256: dc5a0cb52cd6f2740554fcf297c3a95f5a563222fd29433c1f6f22b7b8dbc2e9
font_02_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 11232 bytes
SHA-256: 95404d121c7dfcf927982fc9533f01aa866a01e9b7ca80f6b737c98db7f6fe92
font_03_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1