Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e914a41b5c7dba5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 02:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f56316e5bac496ceb785b0cdd93f59f SHA-1: 1960aafec13eefc549c9232ec713514fefcae726 SHA-256: 0e914a41b5c7dba521f8efbc280bbfbf0e50f3b637226290b63f04aeb38e50a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=mi+note+5+software
    • http://wonsakai.com/uploads/files/silegowitizibawa.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7bfe877bf71a76300459a6e080494c1c/38297111343.pdf
    • http://fandimnarodaku.cz/upload/file/lijugijogese.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/76751265385.pdf
    • http://redskap.ru/userfiles/file/46169302301.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90ad0e020---10558234779.pdf
    • http://kfoodntea.com/dataroom/file/zutajolu.pdf
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15265261552.pdf
    • http://ipceurope.eu/assets/file/nawibelofizinufeguwegipub.pdf
    • http://dobrejaja.com/Upload/file/60448690161.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/12036615158.pdf
    • https://red-adlay.com/upload/files/dinuvefunokunazol.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdf
    • http://bbmeti.it/userfiles/files/regazoruvokurarumapexamul.pdf
    • https://laptopserwis.com/app/webroot/media/files/75379644552.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/87078988649.pdf
    • http://gibisch.info/files/files/88038208187.pdf
    • http://galerie45.com/userfiles/file/65229918558.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0a694c6---gagofakegasijafolu.pdf
    • http://rzn-house.ru/upload/file/42903167636.pdf
    • http://americasbestwingsbeltsville.com/uploads/files/zoronixasenekofubo.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/16306890372.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_off0000db2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 16792 bytes
font_01_sfnt_off0000f343.bin
2a2961d391dca40243ce64f9fdd4cb677527dce27047995b5a2b2679ce2644c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10376 bytes
font_02_sfnt_off00010afb.bin
8f12a992b70b4c0dce2385bf6532689f4f459bc8a4dad2e0f3ecc337e45502b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 20832 bytes

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