Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b919f316aec203e…

MALICIOUS

PDF

88.8 KB Created: 2021-08-04 01:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50b33d50051e0ffa2d3f536adb02c28d SHA-1: 0ecdce9c1d6f56722f8d7c14ad3ee7d62f59a018 SHA-256: 2b919f316aec203e1e18869df8ce0f9d60bc90e88557a8c2c584f73be74cc969
196 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. This behavior, combined with the ML classifier and ClamAV detection, strongly suggests the document is designed to download and execute a secondary payload, likely via a command interpreter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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://cructi.ru/uplcv?utm_term=visual+studio+express+2013+for+windows+desktop+license+expired PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb28b7d73---pijixonukumuguka.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/basirozuvosupen.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3bbb318803b105793712961262b09cc6/zafevi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/lilenugeratefonamuza.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/otixojexel.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/varujesoluvezuleri.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/98896517998.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kezutimigusima.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5864272c6089f0118d554caf024050da/38651149827.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/6994113140.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3acb8804---48877532211.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/8946812603.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d68992c4---39412980116.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0urol9qviceoq38sp0vcttel35/gijenozogobedunopabuduni.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf1b9106cd---xowoxafetaxofutafizos.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad3afceb6bf7a940fbb112ec6b8cdbd5/retipilopofidovejixomi.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/56772349185.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gifuganutufa.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/19805025657.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/sesutefupufofixeleza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a53d8914---xevetufaje.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/71455633343.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/83234928151.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/54389947385.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/306876204f66ab493e35db585a855b41/64744527293.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/99288236522.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6591c912f7---99042325686.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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 17012 bytes
SHA-256: 4fcdf46e2620a8d8139387085bbbfd05f4aba199ddd853cb7ec8d4092bcbad5a
font_01_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 11428 bytes
SHA-256: c90a15e82af1bf4c0c37cefedd2c97d540f98ac41ff31da397fe936652aab8ad

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