Malicious PDF — malware analysis report

Static analysis result for SHA-256 9130859ef15fe937…

MALICIOUS

PDF

99.2 KB Created: 2021-06-26 13:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f73b7eb4254f63b4e337928db6f3f126 SHA-1: 19f294c430cbad4ca8540d4a2e13ff86b4d9bd11 SHA-256: 9130859ef15fe937770531843ea5a2a76288e58bbc5f3b1ddbd5df7ec0889663
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of a 'Security software disable instruction' heuristic strongly suggests the document's intent is to manipulate the user into lowering their defenses. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs pointing to potentially compromised sites indicate a phishing or malware distribution attempt, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://ohcsi.com/ckfinder/userfiles/files/luwujunelubexobemiliguwo.pdf
    • http://annandale1963.com/clients/69704/File/bimipufenuraxorofin.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a16548f5---xeromat.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8e9b1jv7478nd6ea62bpktlvpi/74879010544.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd300d90bac---33183202248.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512005134167897.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/pafaxuwubomifogig.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/42782689796.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ea56d692b05e58ba06cad4fd296dee3b/51392445613.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa559874d---63323146316.pdf
    • https://feng-shuiworld.com/userfiles/file/7167566230.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4946080d---nekenirutisa.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4856563a903ada180b73a04ae1a0aada/88249395193.pdf
    • http://www.awakohchang.com/image/upload/File/otixojexel.pdf
    • http://altaprecision.com/userfiles/file/36565874224.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145a074316.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e96b10c4---kimaxivef.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c2da2583---natifin.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/36dql9i1atllqqg1on7ht51e2e/tilupebo.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5178262ac1---jilukivuda.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/45217371879.pdf
    • https://anthonygillant.com/userfiles/file/42609872975.pdf
    • http://anthonyvienna.com/sites/default/files/file/lawilisofodu.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d663008d---88614503750.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=quality+engineer+interview+questions+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_off00011d8e.bin
0e94678a3abb9084c477e70c564194a03267311e27c8cce4d5f041e8dcad3661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 17480 bytes
font_01_sfnt_off00014b83.bin
300f1a41e061a55776bc27aa6fe75a924898a7d0cc53efa926560ebef53a62ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 11244 bytes
font_02_sfnt_off000165a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165A6 16792 bytes

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