Malicious PDF — malware analysis report

Static analysis result for SHA-256 5685842d70edd1fb…

MALICIOUS

PDF

93.8 KB Created: 2021-08-09 09:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f153b6d76cfe429fefa82a6e3458182c SHA-1: c4442c86757759759a05ca58e5726898ab9f3891 SHA-256: 5685842d70edd1fbfc0e4db3ba3001990994fd6a3516540c6c78513f4f598f1e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious commands or downloading further payloads. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://krisoc.ru/uplcv?utm_term=how+to+mem+patch+xforce+keygen PDF link annotation
    • https://euroroma-bg.org/files/file/nejamemifadezagexumito.pdfIn PDF document text
    • https://aksusu.com/upload/files/tukusuwesuvegajes.pdfIn PDF document text
    • https://ayurmitra.com/files/file/batadasipi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/78494755930.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/11976285145.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xumivufu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/degewipepa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ce539f64---30644552388.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/84942900335.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105261029242771.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/13581005812.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6ce295bc0bec7f610e0c241cdb6fb6de/98501241186.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9669b14bd9---geriwubir.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/38814165480.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t08e1lbtvqdmjse1q6i97k4hp9/diwijiv.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926d4ac83c2---vexirijefipadokod.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/mazusolokigibokez.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/werunerusuzejorusi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3486a0617---valipobegido.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/31214946258.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bf406a394c493b97ddde16ca959a6054/21204370783.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c15a2f51---wagozosufiwovosisuze.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/d4m2itkkce366709vke6flpql8/bonaxaxaneregino.pdfIn PDF document text
    • https://kildevangen.dk/files/welamajuro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16220 bytes
SHA-256: 132f05ce40ac9038317ee37a5988612cc6d75431eb485d801d5d4d5d0d706cfe
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 22052 bytes
SHA-256: 162a094c56b8be5f8dd981a00543e748e5d216a5a01e29f134501c1893df8e21
font_03_sfnt_off00014e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E92 11004 bytes
SHA-256: b283cd8799b266595ec3d33c72e56bda8d383530d3ebb6c2ce90a0e836fcc1a4

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