Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef2d3aa42650c95…

MALICIOUS

PDF

87.1 KB Created: 2021-07-13 10:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 693b263eb2931891bc9c0c7c578462d4 SHA-1: 0a3406c20584e5f6b99a5a275e2c7dd79fe8551b SHA-256: bef2d3aa42650c95ec4919e35399394288824256966a0c16c4adfc28aedcbabf
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and links to numerous compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=tenorshare+reiboot+licensed+email+and+registration+code
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5b771d934a6dd1c8f2031418839b03e8/jufezutoxiroximupu.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752bcc5a357---84936828419.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bk7ci2d5f03r5ikitv6485tgrj/3587822901.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38676132097.pdf
    • http://mofrantech.com/userfiles/file/3638825171.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced3a38f7a---59801997225.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/121d8e4ca01a4f39dd285f10af174d96/6567752967.pdf
    • https://aviseco.ro/userfiles/file/24332871113.pdf
    • http://asckhn.com/acskhn/userfiles/file/15420920151.pdf
    • http://mid-europe-ex.com/84643728929.pdf
    • http://hongpakthai.com/ckfinder/userfiles/files/nedosusuvuwimek.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9op77legsi9lmvda95r3al89jl/xewafuxevabem.pdf
    • http://fine-cottage.ru/userfiles/files/38480975524.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f678e2f2c8d4c0afb2fa401fe92bf050/85752311660.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sp9vpg5r7v8e6of3c1ck44o473/lilubokul.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a92383277e411d121aca94753c1e00eb/jonimotita.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/u12ciqimstci3bm1b02v9rn21r/48927154838.pdf
    • http://medob.org/SITE/files/editor/file/zumububa.pdf
    • http://amoy-art.com/Upload/file/nutenovubonipaxisuxepujiv.pdf
    • http://kurumakaitori-one.com/js/upload/files/melonuruxonebomulaxivov.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7868a8718aaea6fee94811a4abc9d313/57450910250.pdf
    • http://email-database.info/userfiles/file/8939473271.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kufidoturesi.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bk7i6s5smi8hl07n3b9uuupi36/zixefinusomixa.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kg00tk64q6an88av5os1hu8vsb/72303389947.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1a64882143a1eadcbef88cc768888e05/57153217565.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d9.bin
b8fcf2f4aafae49b90ceb81df340a57a4e51ced425d6e001d6460eb44066150f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 17284 bytes
font_01_sfnt_off00011dad.bin
25f28e85d6b67be613a89555a44f85d09c08ab80b3712dcd4d13c259fe494f94
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 10920 bytes
font_02_sfnt_off00013693.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13693 16792 bytes