Malicious PDF — malware analysis report

Static analysis result for SHA-256 923b7ec33ed6e224…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 00:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e51422d55d7d1771796e15dfa6576f8 SHA-1: e89804a6d51a1afa51c01573d66a026898479876 SHA-256: 923b7ec33ed6e224678a450446399f8c46c03528d7270c88a613c2287d785c19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://chcial.ru/uplcv?utm_term=gta+4+ballad+of+gay+tony+cheats PDF link annotation
    • https://dm288.rs/slicice/file/segujaloralosozodakokuve.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109180637374114.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2354f975---gukiviserakoluxidaxipofa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11d9f395e---nizinewusevezikuno.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/87923692987.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25b5a883---papisusizig.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140721f2ea36---sekewolewitupunulasudi.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109110230579225.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lulobajitozegigi.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///xilimadirowi.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/16055519441.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/8581146061.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/narewuj.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/82ji714sq93fv7p4g8bu1omekc/77560693862.pdfIn PDF document text
    • http://asqcert.net/files/files/7864623935.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/ponomuzafasifeda.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/gubusubalifugupeku.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/gabaxotitepi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/48061031164.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/74629722232.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021153358169.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210901105200.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sigubasoduvafati.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/srdo3rlkgcnk93lb4ko2uj17d6/33788642183.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/bapuwaxiditovazoso.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/SF2L9EctgK3z.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/11428246994.pdfIn PDF document text
    • 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_off0000c007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC007 17196 bytes
SHA-256: ef8ee7652f7b0c73eb8f5a3f0d49bc8052320e3923cde3db65c63c5d1188930f
font_01_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 10936 bytes
SHA-256: b30582d4930217b677674a36842a7153bcdecde9aa14a9a5eca73124aad18e3c

Open this report in the interactive analyzer, or submit your own file for analysis.