Malicious PDF — malware analysis report

Static analysis result for SHA-256 972357ab9936f7d8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 11:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc9e361fc02a270adf0f640722098357 SHA-1: abe8374420477b3cf0fca41bb5ef0e1b75ba501d SHA-256: 972357ab9936f7d8e8d8b4bc96ff6083d54040f479188c36c6bbbd1d89ab6e9c
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Clipboard command execution lure' heuristic suggests the document instructs the user to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads. The numerous embedded URLs, many pointing to compromised WordPress sites, indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=merging+jpg+files+to+pdf PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0563dbb32---bidepujosatog.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f092bb09a26---49661609212.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bfc9aa96---28010916589.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161145c98a2a17---44325534936.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074f6e6e2733---99217197092.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/aaf2069e6b29191abe2a717ca43fc1e2/pagoga.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718147bb2ed---xesegesagerelo.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/b335e1963df203129146508e1b937ea9/savepuduboko.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/29450592027.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa118d139a---dawefafe.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/norowitamapegosunatab.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/saweri.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847f4112649---15342658080.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ketavisoferatarufuzo.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/71946977337.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/46777174558.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e04879c27---fodixol.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/nomononalugakonuvepusebi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1or7s5k6kp55lkls1rtmonslod/xoxofekipatal.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/42965966490.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edf0cc4024d---luzazujoritusu.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/junegijepekefajene.pdfIn PDF document text
    • http://chongros.com/userData/board/file/65336165770.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/25001950295.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/3ei7r6dussc2vme2ckh0fjll5b/4388076891.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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 10636 bytes
SHA-256: 0b51611900a7476677cb506cdd22f304f43676e8799a419bd3bab7bfe9794b5d
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 17000 bytes
SHA-256: 958269405b1c930c4828b0b9cd17501b6932056e5e36a76ca60fa103e7c0d9df
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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